diff --git a/arduino/libraries/lint.go b/arduino/libraries/lint.go
deleted file mode 100644
index e604f4e148d..00000000000
--- a/arduino/libraries/lint.go
+++ /dev/null
@@ -1,45 +0,0 @@
-// This file is part of arduino-cli.
-//
-// Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
-//
-// This software is released under the GNU General Public License version 3,
-// which covers the main part of arduino-cli.
-// The terms of this license can be found at:
-// https://www.gnu.org/licenses/gpl-3.0.en.html
-//
-// You can be released from the requirements of the above licenses by purchasing
-// a commercial license. Buying such a license is mandatory if you want to
-// modify or otherwise use the software for commercial activities involving the
-// Arduino software without disclosing the source code of your own applications.
-// To purchase a commercial license, send an email to license@arduino.cc.
-
-package libraries
-
-// Lint produce warnings about the formal correctness of a Library
-func (l *Library) Lint() ([]string, error) {
-
-	// TODO: check for spurious dirs
-	// subDirs, err := ioutil.ReadDir(libraryDir)
-	// if err != nil {
-	// 	return nil, fmt.Errorf("reading dir %s: %s", libraryDir, err)
-	// }
-	// 	for _, subDir := range subDirs {
-	// 		if utils.IsSCCSOrHiddenFile(subDir) {
-	// 			if !utils.IsSCCSFile(subDir) && utils.IsHiddenFile(subDir) {
-	// 				logger.Fprintln(os.Stdout, "warn",
-	// 					"WARNING: Spurious {0} directory in '{1}' library",
-	// 					filepath.Base(subDir.Name()), libProperties["name"])
-	// 			}
-	// 		}
-	// 	}
-
-	// TODO: check for invalid category in library.properties
-	// if !ValidCategories[libProperties["category"]] {
-	//  logger.Fprintln(os.Stdout, "warn",
-	// 	"WARNING: Category '{0}' in library {1} is not valid. Setting to '{2}'",
-	// 	libProperties["category"], libProperties["name"], "Uncategorized")
-	// 	libProperties["category"] = "Uncategorized"
-	// }
-
-	return []string{}, nil
-}
diff --git a/commands/compile/compile.go b/commands/compile/compile.go
index 78ee36f98de..084b2814687 100644
--- a/commands/compile/compile.go
+++ b/commands/compile/compile.go
@@ -33,7 +33,6 @@ import (
 	"github.com/arduino/arduino-cli/configuration"
 	"github.com/arduino/arduino-cli/i18n"
 	"github.com/arduino/arduino-cli/legacy/builder"
-	legacyi18n "github.com/arduino/arduino-cli/legacy/builder/i18n"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
 	"github.com/arduino/arduino-cli/metrics"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
@@ -167,12 +166,6 @@ func Compile(ctx context.Context, req *rpc.CompileRequest, outStream, errStream
 	builderCtx.USBVidPid = req.GetVidPid()
 	builderCtx.WarningsLevel = req.GetWarnings()
 
-	if debug {
-		builderCtx.DebugLevel = 100
-	} else {
-		builderCtx.DebugLevel = 5
-	}
-
 	builderCtx.CustomBuildProperties = append(req.GetBuildProperties(), "build.warn_data_percentage=75")
 
 	if req.GetBuildCachePath() != "" {
@@ -205,9 +198,8 @@ func Compile(ctx context.Context, req *rpc.CompileRequest, outStream, errStream
 		builderCtx.BuiltInLibrariesDirs = paths.NewPathList(ideLibrariesPath)
 	}
 
-	builderCtx.ExecStdout = outStream
-	builderCtx.ExecStderr = errStream
-	builderCtx.SetLogger(&legacyi18n.LoggerToCustomStreams{Stdout: outStream, Stderr: errStream})
+	builderCtx.Stdout = outStream
+	builderCtx.Stderr = errStream
 	builderCtx.Clean = req.GetClean()
 	builderCtx.OnlyUpdateCompilationDatabase = req.GetCreateCompilationDatabaseOnly()
 
diff --git a/docs/UPGRADING.md b/docs/UPGRADING.md
index 0515eeb3365..c61370cc08b 100644
--- a/docs/UPGRADING.md
+++ b/docs/UPGRADING.md
@@ -32,6 +32,29 @@ The `parseArch` parameter was removed since it was unused and was always true. T
 always parsed by the function. Furthermore the function now should also correctly interpret `packager:arch` spelled with
 the wrong casing.
 
+### `github.com/arduino/arduino-cli/i18n.Init(...)` now requires an empty string to be passed for autodetection of locale
+
+For automated detection of locale, change the call from:
+
+```go
+i18n.Init()
+```
+
+to
+
+```go
+i18n.Init("")
+```
+
+### `github.com/arduino/arduino-cli/legacy/i18n` module has been removed (in particular the `i18n.Logger`)
+
+The `i18n.Logger` is no longer available. It was mainly used in the legacy builder struct field `Context.Logger`.
+
+The `Context.Logger` field has been replaced with plain `io.Writer` fields `Contex.Stdout` and `Context.Stderr`. All
+existing logger functionality has been dropped, for example the Java-Style formatting with tags like `{0} {1}...` must
+be replaced with one of the equivalent golang printf-based alternatives and logging levels must be replaced with direct
+writes to `Stdout` or `Stderr`.
+
 ## 0.20.0
 
 ### `board details` arguments change
diff --git a/i18n/convert.go b/i18n/convert.go
new file mode 100644
index 00000000000..eb3b8939732
--- /dev/null
+++ b/i18n/convert.go
@@ -0,0 +1,44 @@
+// This file is part of arduino-cli.
+//
+// Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
+//
+// This software is released under the GNU General Public License version 3,
+// which covers the main part of arduino-cli.
+// The terms of this license can be found at:
+// https://www.gnu.org/licenses/gpl-3.0.en.html
+//
+// You can be released from the requirements of the above licenses by purchasing
+// a commercial license. Buying such a license is mandatory if you want to
+// modify or otherwise use the software for commercial activities involving the
+// Arduino software without disclosing the source code of your own applications.
+// To purchase a commercial license, send an email to license@arduino.cc.
+
+package i18n
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+var javaFormatPlaceholderRegexp = regexp.MustCompile(`{(\d)}`)
+
+// FromJavaToGoSyntax convert a translation string made for Java to a one suitable for golang (printf-style).
+// The conversion transforms java placeholders like "{0}","{1}","{2}",etc... with the equivalent for golang
+// "%[1]v","%[2]v","%[3]v",etc...
+// The double single-quote "''" is translated into a single single-quote "'".
+func FromJavaToGoSyntax(s string) string {
+	// Replace "{x}" => "%[x+1]v"
+	for _, submatch := range javaFormatPlaceholderRegexp.FindAllStringSubmatch(s, -1) {
+		idx, err := strconv.Atoi(submatch[1])
+		if err != nil {
+			panic(err)
+		}
+		s = strings.Replace(s, submatch[0], "%["+strconv.Itoa(idx+1)+"]v", -1)
+	}
+
+	// Replace "''" => "'"
+	s = strings.Replace(s, "''", "'", -1)
+
+	return s
+}
diff --git a/i18n/convert_test.go b/i18n/convert_test.go
new file mode 100644
index 00000000000..618fa977b3b
--- /dev/null
+++ b/i18n/convert_test.go
@@ -0,0 +1,54 @@
+// This file is part of arduino-cli.
+//
+// Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
+//
+// This software is released under the GNU General Public License version 3,
+// which covers the main part of arduino-cli.
+// The terms of this license can be found at:
+// https://www.gnu.org/licenses/gpl-3.0.en.html
+//
+// You can be released from the requirements of the above licenses by purchasing
+// a commercial license. Buying such a license is mandatory if you want to
+// modify or otherwise use the software for commercial activities involving the
+// Arduino software without disclosing the source code of your own applications.
+// To purchase a commercial license, send an email to license@arduino.cc.
+
+package i18n
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func format(format string, a ...interface{}) string {
+	format = FromJavaToGoSyntax(format)
+	message := fmt.Sprintf(format, a...)
+	return message
+}
+
+func TestI18NSyntax(t *testing.T) {
+	require.Equal(t, "Do you want to remove %[1]v?\nIf you do so you won't be able to use %[1]v any more.", FromJavaToGoSyntax("Do you want to remove {0}?\nIf you do so you won't be able to use {0} any more."))
+	require.Equal(t, "A file named \"%[1]v\" already exists in \"%[2]v\"", FromJavaToGoSyntax("A file named \"{0}\" already exists in \"{1}\""))
+	require.Equal(t, "Board %[1]v:%[2]v:%[3]v doesn't define a 'build.board' preference. Auto-set to: %[4]v", FromJavaToGoSyntax("Board {0}:{1}:{2} doesn''t define a ''build.board'' preference. Auto-set to: {3}"))
+
+	require.Equal(t, "22 11\n", fmt.Sprintf("%[2]d %[1]d\n", 11, 22))
+	require.Equal(t, "d c b a", format("{3} {2} {1} {0}", "a", "b", "c", "d"))
+
+	require.Equal(t, "e d b a", format("{4} {3} {1} {0}", "a", "b", "c", "d", "e"))
+
+	require.Equal(t, "a b", format("{0} {1}", "a", "b", "c", "d", "e"))
+
+	require.Equal(t, "%!v(BADINDEX) c b a", format("{3} {2} {1} {0}", "a", "b", "c"))
+	require.Equal(t, "%!v(BADINDEX) %!v(BADINDEX) %!v(BADINDEX) %!v(BADINDEX)", format("{3} {2} {1} {0}"))
+
+	require.Equal(t, "I'm %[1]v%% sure", FromJavaToGoSyntax("I'm {0}%% sure"))
+	require.Equal(t, "I'm 100% sure", format("I'm {0}%% sure", 100))
+
+	require.Equal(t, "Either in [1] or in [2]", format("Either in [{0}] or in [{1}]", 1, 2))
+
+	require.Equal(t, "Using library a at version b in folder: c ", format("Using library {0} at version {1} in folder: {2} {3}", "a", "b", "c", ""))
+
+	require.Equal(t, "Missing 'a' from library in b", format("Missing '{0}' from library in {1}", "a", "b"))
+}
diff --git a/i18n/i18n.go b/i18n/i18n.go
index a9ac5f74c07..aa4f82edd33 100644
--- a/i18n/i18n.go
+++ b/i18n/i18n.go
@@ -19,14 +19,10 @@ package i18n
 // 1. Locale specified via the function call
 // 2. OS Locale
 // 3. en (default)
-func Init(configLocale ...string) {
+func Init(configLocale string) {
 	locales := supportedLocales()
-	if len(configLocale) > 1 {
-		panic("Multiple arguments not supported")
-	}
-
-	if len(configLocale) > 0 && configLocale[0] != "" {
-		if locale := findMatchingLocale(configLocale[0], locales); locale != "" {
+	if configLocale != "" {
+		if locale := findMatchingLocale(configLocale, locales); locale != "" {
 			setLocale(locale)
 			return
 		}
diff --git a/legacy/builder/add_build_board_property_if_missing.go b/legacy/builder/add_build_board_property_if_missing.go
index 973b8041b8e..69791318222 100644
--- a/legacy/builder/add_build_board_property_if_missing.go
+++ b/legacy/builder/add_build_board_property_if_missing.go
@@ -16,7 +16,6 @@
 package builder
 
 import (
-	"os"
 	"strings"
 
 	"github.com/arduino/arduino-cli/legacy/builder/constants"
@@ -27,7 +26,6 @@ type AddBuildBoardPropertyIfMissing struct{}
 
 func (*AddBuildBoardPropertyIfMissing) Run(ctx *types.Context) error {
 	packages := ctx.Hardware
-	logger := ctx.GetLogger()
 
 	for _, aPackage := range packages {
 		for _, platform := range aPackage.Platforms {
@@ -35,14 +33,10 @@ func (*AddBuildBoardPropertyIfMissing) Run(ctx *types.Context) error {
 				for _, board := range platformRelease.Boards {
 					if board.Properties.Get("build.board") == "" {
 						board.Properties.Set("build.board", strings.ToUpper(platform.Architecture+"_"+board.BoardID))
-						logger.Fprintln(
-							os.Stdout,
-							constants.LOG_LEVEL_WARN,
-							tr("Warning: Board {0}:{1}:{2} doesn''t define a %s preference. Auto-set to: {3}", "''build.board''"),
-							aPackage.Name,
-							platform.Architecture,
-							board.BoardID,
-							board.Properties.Get(constants.BUILD_PROPERTIES_BUILD_BOARD))
+						ctx.Info(tr("Warning: Board %[1]s doesn't define a %[2]s preference. Auto-set to: %[3]s",
+							aPackage.Name+":"+platform.Architecture+":"+board.BoardID,
+							"'build.board'",
+							board.Properties.Get(constants.BUILD_PROPERTIES_BUILD_BOARD)))
 					}
 				}
 			}
diff --git a/legacy/builder/builder.go b/legacy/builder/builder.go
index f4de21815d1..10588b341f0 100644
--- a/legacy/builder/builder.go
+++ b/legacy/builder/builder.go
@@ -16,9 +16,7 @@
 package builder
 
 import (
-	"os"
 	"reflect"
-	"strconv"
 	"time"
 
 	"github.com/arduino/arduino-cli/arduino/sketch"
@@ -27,6 +25,7 @@ import (
 	"github.com/arduino/arduino-cli/legacy/builder/types"
 	"github.com/arduino/arduino-cli/legacy/builder/utils"
 	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
 )
 
 var tr = i18n.Tr
@@ -57,31 +56,31 @@ func (s *Builder) Run(ctx *types.Context) error {
 
 		&ContainerMergeCopySketchFiles{},
 
-		utils.LogIfVerbose("info", tr("Detecting libraries used...")),
+		utils.LogIfVerbose(false, tr("Detecting libraries used...")),
 		&ContainerFindIncludes{},
 
 		&WarnAboutArchIncompatibleLibraries{},
 
-		utils.LogIfVerbose("info", tr("Generating function prototypes...")),
+		utils.LogIfVerbose(false, tr("Generating function prototypes...")),
 		&PreprocessSketch{},
 
-		utils.LogIfVerbose("info", tr("Compiling sketch...")),
+		utils.LogIfVerbose(false, tr("Compiling sketch...")),
 		&RecipeByPrefixSuffixRunner{Prefix: "recipe.hooks.sketch.prebuild", Suffix: ".pattern"},
 		&phases.SketchBuilder{},
 		&RecipeByPrefixSuffixRunner{Prefix: "recipe.hooks.sketch.postbuild", Suffix: ".pattern", SkipIfOnlyUpdatingCompilationDatabase: true},
 
-		utils.LogIfVerbose("info", tr("Compiling libraries...")),
+		utils.LogIfVerbose(false, tr("Compiling libraries...")),
 		&RecipeByPrefixSuffixRunner{Prefix: "recipe.hooks.libraries.prebuild", Suffix: ".pattern"},
 		&UnusedCompiledLibrariesRemover{},
 		&phases.LibrariesBuilder{},
 		&RecipeByPrefixSuffixRunner{Prefix: "recipe.hooks.libraries.postbuild", Suffix: ".pattern", SkipIfOnlyUpdatingCompilationDatabase: true},
 
-		utils.LogIfVerbose("info", tr("Compiling core...")),
+		utils.LogIfVerbose(false, tr("Compiling core...")),
 		&RecipeByPrefixSuffixRunner{Prefix: "recipe.hooks.core.prebuild", Suffix: ".pattern"},
 		&phases.CoreBuilder{},
 		&RecipeByPrefixSuffixRunner{Prefix: "recipe.hooks.core.postbuild", Suffix: ".pattern", SkipIfOnlyUpdatingCompilationDatabase: true},
 
-		utils.LogIfVerbose("info", tr("Linking everything together...")),
+		utils.LogIfVerbose(false, tr("Linking everything together...")),
 		&RecipeByPrefixSuffixRunner{Prefix: "recipe.hooks.linking.prelink", Suffix: ".pattern"},
 		&phases.Linker{},
 		&RecipeByPrefixSuffixRunner{Prefix: "recipe.hooks.linking.postlink", Suffix: ".pattern", SkipIfOnlyUpdatingCompilationDatabase: true},
@@ -163,7 +162,7 @@ func (s *Preprocess) Run(ctx *types.Context) error {
 	}
 
 	// Output arduino-preprocessed source
-	ctx.ExecStdout.Write([]byte(ctx.Source))
+	ctx.Stdout.Write([]byte(ctx.Source))
 	return nil
 }
 
@@ -200,9 +199,7 @@ func runCommands(ctx *types.Context, commands []types.Command) error {
 }
 
 func PrintRingNameIfDebug(ctx *types.Context, command types.Command) {
-	if ctx.DebugLevel >= 10 {
-		ctx.GetLogger().Fprintln(os.Stdout, "debug", "Ts: {0} - Running: {1}", strconv.FormatInt(time.Now().Unix(), 10), reflect.Indirect(reflect.ValueOf(command)).Type().Name())
-	}
+	logrus.Debugf("Ts: %d - Running: %s", time.Now().Unix(), reflect.Indirect(reflect.ValueOf(command)).Type().Name())
 }
 
 func RunBuilder(ctx *types.Context) error {
diff --git a/legacy/builder/builder_utils/utils.go b/legacy/builder/builder_utils/utils.go
index e5cc2c25cee..3f98139956b 100644
--- a/legacy/builder/builder_utils/utils.go
+++ b/legacy/builder/builder_utils/utils.go
@@ -30,6 +30,7 @@ import (
 	"github.com/arduino/go-paths-helper"
 	"github.com/arduino/go-properties-orderedmap"
 	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
 )
 
 var tr = i18n.Tr
@@ -215,7 +216,6 @@ func compileFilesWithRecipe(ctx *types.Context, sourcePath *paths.Path, sources
 }
 
 func compileFileWithRecipe(ctx *types.Context, sourcePath *paths.Path, source *paths.Path, buildPath *paths.Path, buildProperties *properties.Map, includes []string, recipe string) (*paths.Path, error) {
-	logger := ctx.GetLogger()
 	properties := buildProperties.Clone()
 	properties.Set(constants.BUILD_PROPERTIES_COMPILER_WARNING_FLAGS, properties.Get(constants.BUILD_PROPERTIES_COMPILER_WARNING_FLAGS+"."+ctx.WarningsLevel))
 	properties.Set(constants.BUILD_PROPERTIES_INCLUDES, strings.Join(includes, constants.SPACE))
@@ -251,9 +251,9 @@ func compileFileWithRecipe(ctx *types.Context, sourcePath *paths.Path, source *p
 		}
 	} else if ctx.Verbose {
 		if objIsUpToDate {
-			logger.Println(constants.LOG_LEVEL_INFO, tr("Using previously compiled file: {0}"), objectFile)
+			ctx.Info(tr("Using previously compiled file: %[1]s", objectFile))
 		} else {
-			logger.Println("info", tr("Skipping compile of: {0}"), objectFile)
+			ctx.Info(tr("Skipping compile of: %[1]s", objectFile))
 		}
 	}
 
@@ -261,15 +261,9 @@ func compileFileWithRecipe(ctx *types.Context, sourcePath *paths.Path, source *p
 }
 
 func ObjFileIsUpToDate(ctx *types.Context, sourceFile, objectFile, dependencyFile *paths.Path) (bool, error) {
-	logger := ctx.GetLogger()
-	debugLevel := ctx.DebugLevel
-	if debugLevel >= 20 {
-		logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("Checking previous results for {0} (result = {1}, dep = {2})"), sourceFile, objectFile, dependencyFile)
-	}
+	logrus.Debugf("Checking previous results for %v (result = %v, dep = %v)", sourceFile, objectFile, dependencyFile)
 	if objectFile == nil || dependencyFile == nil {
-		if debugLevel >= 20 {
-			logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("Not found: nil"))
-		}
+		logrus.Debugf("Not found: nil")
 		return false, nil
 	}
 
@@ -283,9 +277,7 @@ func ObjFileIsUpToDate(ctx *types.Context, sourceFile, objectFile, dependencyFil
 	objectFileStat, err := objectFile.Stat()
 	if err != nil {
 		if os.IsNotExist(err) {
-			if debugLevel >= 20 {
-				logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("Not found: {0}"), objectFile)
-			}
+			logrus.Debugf("Not found: %v", objectFile)
 			return false, nil
 		} else {
 			return false, errors.WithStack(err)
@@ -296,9 +288,7 @@ func ObjFileIsUpToDate(ctx *types.Context, sourceFile, objectFile, dependencyFil
 	dependencyFileStat, err := dependencyFile.Stat()
 	if err != nil {
 		if os.IsNotExist(err) {
-			if debugLevel >= 20 {
-				logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("Not found: {0}"), dependencyFile)
-			}
+			logrus.Debugf("Not found: %v", dependencyFile)
 			return false, nil
 		} else {
 			return false, errors.WithStack(err)
@@ -306,15 +296,11 @@ func ObjFileIsUpToDate(ctx *types.Context, sourceFile, objectFile, dependencyFil
 	}
 
 	if sourceFileStat.ModTime().After(objectFileStat.ModTime()) {
-		if debugLevel >= 20 {
-			logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("{0} newer than {1}"), sourceFile, objectFile)
-		}
+		logrus.Debugf("%v newer than %v", sourceFile, objectFile)
 		return false, nil
 	}
 	if sourceFileStat.ModTime().After(dependencyFileStat.ModTime()) {
-		if debugLevel >= 20 {
-			logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("{0} newer than {1}"), sourceFile, dependencyFile)
-		}
+		logrus.Debugf("%v newer than %v", sourceFile, dependencyFile)
 		return false, nil
 	}
 
@@ -334,16 +320,12 @@ func ObjFileIsUpToDate(ctx *types.Context, sourceFile, objectFile, dependencyFil
 
 	firstRow := rows[0]
 	if !strings.HasSuffix(firstRow, ":") {
-		if debugLevel >= 20 {
-			logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("No colon in first line of depfile"))
-		}
+		logrus.Debugf("No colon in first line of depfile")
 		return false, nil
 	}
 	objFileInDepFile := firstRow[:len(firstRow)-1]
 	if objFileInDepFile != objectFile.String() {
-		if debugLevel >= 20 {
-			logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("Depfile is about different file: {0}"), objFileInDepFile)
-		}
+		logrus.Debugf("Depfile is about different file: %v", objFileInDepFile)
 		return false, nil
 	}
 
@@ -363,22 +345,15 @@ func ObjFileIsUpToDate(ctx *types.Context, sourceFile, objectFile, dependencyFil
 		if err != nil && !os.IsNotExist(err) {
 			// There is probably a parsing error of the dep file
 			// Ignore the error and trigger a full rebuild anyway
-			if debugLevel >= 20 {
-				logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("Failed to read: {0}"), row)
-				logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, err.Error())
-			}
+			logrus.WithError(err).Debugf("Failed to read: %v", row)
 			return false, nil
 		}
 		if os.IsNotExist(err) {
-			if debugLevel >= 20 {
-				logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("Not found: {0}"), row)
-			}
+			logrus.Debugf("Not found: %v", row)
 			return false, nil
 		}
 		if depStat.ModTime().After(objectFileStat.ModTime()) {
-			if debugLevel >= 20 {
-				logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("{0} newer than {1}"), row, objectFile)
-			}
+			logrus.Debugf("%v newer than %v", row, objectFile)
 			return false, nil
 		}
 	}
@@ -455,12 +430,11 @@ func TXTBuildRulesHaveChanged(corePath, targetCorePath, targetFile *paths.Path)
 }
 
 func ArchiveCompiledFiles(ctx *types.Context, buildPath *paths.Path, archiveFile *paths.Path, objectFilesToArchive paths.PathList, buildProperties *properties.Map) (*paths.Path, error) {
-	logger := ctx.GetLogger()
 	archiveFilePath := buildPath.JoinPath(archiveFile)
 
 	if ctx.OnlyUpdateCompilationDatabase {
 		if ctx.Verbose {
-			logger.Println("info", tr("Skipping archive creation of: {0}"), archiveFilePath)
+			ctx.Info(tr("Skipping archive creation of: %[1]s", archiveFilePath))
 		}
 		return archiveFilePath, nil
 	}
@@ -483,7 +457,7 @@ func ArchiveCompiledFiles(ctx *types.Context, buildPath *paths.Path, archiveFile
 			}
 		} else {
 			if ctx.Verbose {
-				logger.Println(constants.LOG_LEVEL_INFO, tr("Using previously compiled file: {0}"), archiveFilePath)
+				ctx.Info(tr("Using previously compiled file: %[1]s", archiveFilePath))
 			}
 			return archiveFilePath, nil
 		}
@@ -514,7 +488,7 @@ const COMMANDLINE_LIMIT = 30000
 func PrepareCommandForRecipe(buildProperties *properties.Map, recipe string, removeUnsetProperties bool) (*exec.Cmd, error) {
 	pattern := buildProperties.Get(recipe)
 	if pattern == "" {
-		return nil, errors.Errorf(tr("%s pattern is missing"), recipe)
+		return nil, errors.Errorf(tr("%[1]s pattern is missing"), recipe)
 	}
 
 	commandLine := buildProperties.ExpandPropsInString(pattern)
diff --git a/legacy/builder/container_add_prototypes.go b/legacy/builder/container_add_prototypes.go
index cc3a77ab407..ed16f6e2aff 100644
--- a/legacy/builder/container_add_prototypes.go
+++ b/legacy/builder/container_add_prototypes.go
@@ -16,6 +16,8 @@
 package builder
 
 import (
+	"fmt"
+
 	bldr "github.com/arduino/arduino-cli/arduino/builder"
 	"github.com/arduino/arduino-cli/legacy/builder/constants"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
@@ -39,7 +41,10 @@ func (s *ContainerAddPrototypes) Run(ctx *types.Context) error {
 		}
 
 		// Do not bail out if we are generating the compile commands database
-		ctx.GetLogger().Println("info", "%s: %s", tr("An error occurred adding prototypes"), tr("the compilation database may be incomplete or inaccurate"))
+		ctx.Info(
+			fmt.Sprintf("%s: %s",
+				tr("An error occurred adding prototypes"),
+				tr("the compilation database may be incomplete or inaccurate")))
 		if err := sourceFile.CopyTo(targetFilePath); err != nil {
 			return errors.WithStack(err)
 		}
diff --git a/legacy/builder/container_find_includes.go b/legacy/builder/container_find_includes.go
index 19b587921e9..c8c5325eac9 100644
--- a/legacy/builder/container_find_includes.go
+++ b/legacy/builder/container_find_includes.go
@@ -100,7 +100,6 @@ import (
 
 	"github.com/arduino/arduino-cli/arduino/libraries"
 	"github.com/arduino/arduino-cli/legacy/builder/builder_utils"
-	"github.com/arduino/arduino-cli/legacy/builder/constants"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
 	"github.com/arduino/arduino-cli/legacy/builder/utils"
 	"github.com/arduino/go-paths-helper"
@@ -112,7 +111,10 @@ type ContainerFindIncludes struct{}
 func (s *ContainerFindIncludes) Run(ctx *types.Context) error {
 	err := s.findIncludes(ctx)
 	if err != nil && ctx.OnlyUpdateCompilationDatabase {
-		ctx.GetLogger().Println("info", "%s: %s", tr("An error occurred detecting libraries"), tr("the compilation database may be incomplete or inaccurate"))
+		ctx.Info(
+			fmt.Sprintf("%s: %s",
+				tr("An error occurred detecting libraries"),
+				tr("the compilation database may be incomplete or inaccurate")))
 		return nil
 	}
 	return err
@@ -330,7 +332,7 @@ func findIncludesUntilDone(ctx *types.Context, cache *includeCache, sourceFile t
 				// Fully precompiled libraries should have no dependencies
 				// to avoid ABI breakage
 				if ctx.Verbose {
-					ctx.GetLogger().Println(constants.LOG_LEVEL_DEBUG, tr("Skipping dependencies detection for precompiled library {0}"), library.Name)
+					ctx.Info(tr("Skipping dependencies detection for precompiled library %[1]s", library.Name))
 				}
 				return nil
 			}
@@ -342,7 +344,7 @@ func findIncludesUntilDone(ctx *types.Context, cache *includeCache, sourceFile t
 		if unchanged && cache.valid {
 			include = cache.Next().Include
 			if first && ctx.Verbose {
-				ctx.GetLogger().Println(constants.LOG_LEVEL_INFO, tr("Using cached library dependencies for file: {0}"), sourcePath)
+				ctx.Info(tr("Using cached library dependencies for file: %[1]s", sourcePath))
 			}
 		} else {
 			preproc_stderr, preproc_err = GCCPreprocRunnerForDiscoveringIncludes(ctx, sourcePath, targetFilePath, includes)
@@ -359,7 +361,7 @@ func findIncludesUntilDone(ctx *types.Context, cache *includeCache, sourceFile t
 			} else {
 				include = IncludesFinderWithRegExp(string(preproc_stderr))
 				if include == "" && ctx.Verbose {
-					ctx.GetLogger().Println(constants.LOG_LEVEL_DEBUG, tr("Error while detecting libraries included by {0}"), sourcePath)
+					ctx.Info(tr("Error while detecting libraries included by %[1]s", sourcePath))
 				}
 			}
 		}
@@ -386,7 +388,7 @@ func findIncludesUntilDone(ctx *types.Context, cache *includeCache, sourceFile t
 					return errors.New(tr("Internal error in cache"))
 				}
 			}
-			ctx.ExecStderr.Write(preproc_stderr)
+			ctx.Stderr.Write(preproc_stderr)
 			return errors.WithStack(preproc_err)
 		}
 
diff --git a/legacy/builder/create_cmake_rule.go b/legacy/builder/create_cmake_rule.go
index 875f76afdcb..9e8f499605c 100644
--- a/legacy/builder/create_cmake_rule.go
+++ b/legacy/builder/create_cmake_rule.go
@@ -27,7 +27,6 @@ import (
 
 	"github.com/arduino/arduino-cli/legacy/builder/builder_utils"
 	"github.com/arduino/arduino-cli/legacy/builder/constants"
-	"github.com/arduino/arduino-cli/legacy/builder/i18n"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
 	"github.com/arduino/arduino-cli/legacy/builder/utils"
 )
@@ -42,9 +41,6 @@ type ExportProjectCMake struct {
 }
 
 func (s *ExportProjectCMake) Run(ctx *types.Context) error {
-	//verbose := ctx.Verbose
-	logger := ctx.GetLogger()
-
 	if s.SketchError || !canExportCmakeProject(ctx) {
 		return nil
 	}
@@ -160,9 +156,9 @@ func (s *ExportProjectCMake) Run(ctx *types.Context) error {
 	var dynamicLibsFromGccMinusL []string
 	var linkDirectories []string
 
-	extractCompileFlags(ctx, constants.RECIPE_C_COMBINE_PATTERN, &defines, &dynamicLibsFromGccMinusL, &linkerflags, &linkDirectories, logger)
-	extractCompileFlags(ctx, constants.RECIPE_C_PATTERN, &defines, &dynamicLibsFromGccMinusL, &linkerflags, &linkDirectories, logger)
-	extractCompileFlags(ctx, constants.RECIPE_CPP_PATTERN, &defines, &dynamicLibsFromGccMinusL, &linkerflags, &linkDirectories, logger)
+	extractCompileFlags(ctx, constants.RECIPE_C_COMBINE_PATTERN, &defines, &dynamicLibsFromGccMinusL, &linkerflags, &linkDirectories)
+	extractCompileFlags(ctx, constants.RECIPE_C_PATTERN, &defines, &dynamicLibsFromGccMinusL, &linkerflags, &linkDirectories)
+	extractCompileFlags(ctx, constants.RECIPE_CPP_PATTERN, &defines, &dynamicLibsFromGccMinusL, &linkerflags, &linkDirectories)
 
 	// Extract folders with .h in them for adding in include list
 	var headerFiles []string
@@ -240,7 +236,7 @@ func canExportCmakeProject(ctx *types.Context) bool {
 	return ctx.BuildProperties.Get("compiler.export_cmake") != ""
 }
 
-func extractCompileFlags(ctx *types.Context, recipe string, defines, dynamicLibs, linkerflags, linkDirectories *[]string, logger i18n.Logger) {
+func extractCompileFlags(ctx *types.Context, recipe string, defines, dynamicLibs, linkerflags, linkDirectories *[]string) {
 	command, _ := builder_utils.PrepareCommandForRecipe(ctx.BuildProperties, recipe, true)
 
 	for _, arg := range command.Args {
diff --git a/legacy/builder/fail_if_buildpath_equals_sketchpath.go b/legacy/builder/fail_if_buildpath_equals_sketchpath.go
index 48bdb967401..0cfe7073a77 100644
--- a/legacy/builder/fail_if_buildpath_equals_sketchpath.go
+++ b/legacy/builder/fail_if_buildpath_equals_sketchpath.go
@@ -16,7 +16,6 @@
 package builder
 
 import (
-	"github.com/arduino/arduino-cli/legacy/builder/i18n"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
 	"github.com/pkg/errors"
 )
@@ -40,8 +39,7 @@ func (s *FailIfBuildPathEqualsSketchPath) Run(ctx *types.Context) error {
 	sketchPath = sketchPath.Parent()
 
 	if buildPath.EqualsTo(sketchPath) {
-		return i18n.ErrorfWithLogger(ctx.GetLogger(),
-			tr("Sketch cannot be located in build path. Please specify a different build path"))
+		return errors.New(tr("Sketch cannot be located in build path. Please specify a different build path"))
 	}
 
 	return nil
diff --git a/legacy/builder/fail_if_imported_library_is_wrong.go b/legacy/builder/fail_if_imported_library_is_wrong.go
index 139dd900e2c..34a69d8d9c2 100644
--- a/legacy/builder/fail_if_imported_library_is_wrong.go
+++ b/legacy/builder/fail_if_imported_library_is_wrong.go
@@ -16,9 +16,10 @@
 package builder
 
 import (
+	"errors"
+
 	"github.com/arduino/arduino-cli/arduino/libraries"
 	"github.com/arduino/arduino-cli/legacy/builder/constants"
-	"github.com/arduino/arduino-cli/legacy/builder/i18n"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
 )
 
@@ -29,21 +30,19 @@ func (s *FailIfImportedLibraryIsWrong) Run(ctx *types.Context) error {
 		return nil
 	}
 
-	logger := ctx.GetLogger()
-
 	for _, library := range ctx.ImportedLibraries {
 		if !library.IsLegacy {
 			if library.InstallDir.Join(constants.LIBRARY_FOLDER_ARCH).IsDir() {
-				return i18n.ErrorfWithLogger(logger, tr("%[1]s folder is no longer supported! See %[2]s for more information", "'arch'", "http://goo.gl/gfFJzU"))
+				return errors.New(tr("%[1]s folder is no longer supported! See %[2]s for more information", "'arch'", "http://goo.gl/gfFJzU"))
 			}
 			for _, propName := range libraries.MandatoryProperties {
 				if !library.Properties.ContainsKey(propName) {
-					return i18n.ErrorfWithLogger(logger, tr("Missing '{0}' from library in {1}"), propName, library.InstallDir)
+					return errors.New(tr("Missing '%[1]s' from library in %[2]s", propName, library.InstallDir))
 				}
 			}
 			if library.Layout == libraries.RecursiveLayout {
 				if library.UtilityDir != nil {
-					return i18n.ErrorfWithLogger(logger, tr("Library can't use both '%[1]s' and '%[2]s' folders. Double check {0}", "src", "utility"), library.InstallDir)
+					return errors.New(tr("Library can't use both '%[1]s' and '%[2]s' folders. Double check in '%[3]s'.", "src", "utility", library.InstallDir))
 				}
 			}
 		}
diff --git a/legacy/builder/hardware_loader.go b/legacy/builder/hardware_loader.go
index a73f4ecad86..70ce36a9524 100644
--- a/legacy/builder/hardware_loader.go
+++ b/legacy/builder/hardware_loader.go
@@ -34,9 +34,8 @@ func (s *HardwareLoader) Run(ctx *types.Context) error {
 			// When we're gonna refactor the legacy package this will be gone.
 
 			if ctx.Verbose {
-				log := ctx.GetLogger()
 				for _, err := range errs {
-					log.Println("info", "Error loading hardware platform: {0}", err.Message())
+					ctx.Info(tr("Error loading hardware platform: %[1]s", err.Message()))
 				}
 			}
 		}
diff --git a/legacy/builder/i18n/errors.go b/legacy/builder/i18n/errors.go
deleted file mode 100644
index 4080742690b..00000000000
--- a/legacy/builder/i18n/errors.go
+++ /dev/null
@@ -1,16 +0,0 @@
-package i18n
-
-import (
-	"os"
-
-	"github.com/arduino/arduino-cli/legacy/builder/constants"
-	"github.com/pkg/errors"
-)
-
-func ErrorfWithLogger(logger Logger, format string, a ...interface{}) error {
-	if _, isMachineLogger := logger.(*MachineLogger); isMachineLogger {
-		logger.Fprintln(os.Stderr, constants.LOG_LEVEL_ERROR, format, a...)
-		return errors.New("")
-	}
-	return errors.New(Format(format, a...))
-}
diff --git a/legacy/builder/i18n/i18n.go b/legacy/builder/i18n/i18n.go
deleted file mode 100644
index 3d745f0a49b..00000000000
--- a/legacy/builder/i18n/i18n.go
+++ /dev/null
@@ -1,139 +0,0 @@
-// This file is part of arduino-cli.
-//
-// Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
-//
-// This software is released under the GNU General Public License version 3,
-// which covers the main part of arduino-cli.
-// The terms of this license can be found at:
-// https://www.gnu.org/licenses/gpl-3.0.en.html
-//
-// You can be released from the requirements of the above licenses by purchasing
-// a commercial license. Buying such a license is mandatory if you want to
-// modify or otherwise use the software for commercial activities involving the
-// Arduino software without disclosing the source code of your own applications.
-// To purchase a commercial license, send an email to license@arduino.cc.
-
-package i18n
-
-import (
-	"fmt"
-	"io"
-	"net/url"
-	"os"
-	"regexp"
-	"strconv"
-	"strings"
-	"sync"
-)
-
-var PLACEHOLDER = regexp.MustCompile(`{(\d)}`)
-
-type Logger interface {
-	Fprintln(w io.Writer, level string, format string, a ...interface{})
-	Println(level string, format string, a ...interface{})
-}
-
-type LoggerToCustomStreams struct {
-	Stdout io.Writer
-	Stderr io.Writer
-	mux    sync.Mutex
-}
-
-func (s *LoggerToCustomStreams) Fprintln(w io.Writer, level string, format string, a ...interface{}) {
-	s.mux.Lock()
-	defer s.mux.Unlock()
-	target := s.Stdout
-	if w == os.Stderr {
-		target = s.Stderr
-	}
-	fmt.Fprintln(target, Format(format, a...))
-}
-
-func (s *LoggerToCustomStreams) Println(level string, format string, a ...interface{}) {
-	s.Fprintln(nil, level, format, a...)
-}
-
-type NoopLogger struct{}
-
-func (s *NoopLogger) Fprintln(w io.Writer, level string, format string, a ...interface{}) {}
-
-func (s *NoopLogger) Println(level string, format string, a ...interface{}) {}
-
-type HumanTagsLogger struct{}
-
-func (s *HumanTagsLogger) Fprintln(w io.Writer, level string, format string, a ...interface{}) {
-	format = "[" + level + "] " + format
-	fprintln(w, Format(format, a...))
-}
-
-func (s *HumanTagsLogger) Println(level string, format string, a ...interface{}) {
-	s.Fprintln(os.Stdout, level, format, a...)
-}
-
-type HumanLogger struct{}
-
-func (s *HumanLogger) Fprintln(w io.Writer, level string, format string, a ...interface{}) {
-	fprintln(w, Format(format, a...))
-}
-
-func (s *HumanLogger) Println(level string, format string, a ...interface{}) {
-	s.Fprintln(os.Stdout, level, format, a...)
-}
-
-type MachineLogger struct{}
-
-func (s *MachineLogger) Fprintln(w io.Writer, level string, format string, a ...interface{}) {
-	printMachineFormattedLogLine(w, level, format, a)
-}
-
-func (s *MachineLogger) Println(level string, format string, a ...interface{}) {
-	printMachineFormattedLogLine(os.Stdout, level, format, a)
-}
-
-func printMachineFormattedLogLine(w io.Writer, level string, format string, a []interface{}) {
-	a = append([]interface{}(nil), a...)
-	for idx, value := range a {
-		if str, ok := value.(string); ok {
-			a[idx] = url.QueryEscape(str)
-		} else if stringer, ok := value.(fmt.Stringer); ok {
-			a[idx] = url.QueryEscape(stringer.String())
-		}
-	}
-	fprintf(w, "===%s ||| %s ||| %s\n", level, format, a)
-}
-
-var lock sync.Mutex
-
-func fprintln(w io.Writer, s string) {
-	lock.Lock()
-	defer lock.Unlock()
-	fmt.Fprintln(w, s)
-}
-
-func fprintf(w io.Writer, format string, a ...interface{}) {
-	lock.Lock()
-	defer lock.Unlock()
-	fmt.Fprintf(w, format, a...)
-}
-
-func FromJavaToGoSyntax(s string) string {
-	submatches := PLACEHOLDER.FindAllStringSubmatch(s, -1)
-	for _, submatch := range submatches {
-		idx, err := strconv.Atoi(submatch[1])
-		if err != nil {
-			panic(err)
-		}
-		idx = idx + 1
-		s = strings.Replace(s, submatch[0], "%["+strconv.Itoa(idx)+"]v", -1)
-	}
-
-	s = strings.Replace(s, "''", "'", -1)
-
-	return s
-}
-
-func Format(format string, a ...interface{}) string {
-	format = FromJavaToGoSyntax(format)
-	message := fmt.Sprintf(format, a...)
-	return message
-}
diff --git a/legacy/builder/libraries_loader.go b/legacy/builder/libraries_loader.go
index d486febe95e..97ca9339c1c 100644
--- a/legacy/builder/libraries_loader.go
+++ b/legacy/builder/libraries_loader.go
@@ -16,8 +16,6 @@
 package builder
 
 import (
-	"os"
-
 	"github.com/arduino/arduino-cli/arduino/libraries"
 	"github.com/arduino/arduino-cli/arduino/libraries/librariesmanager"
 	"github.com/arduino/arduino-cli/arduino/libraries/librariesresolver"
@@ -39,9 +37,6 @@ func (s *LibrariesLoader) Run(ctx *types.Context) error {
 		lm.AddLibrariesDir(folder, libraries.IDEBuiltIn)
 	}
 
-	debugLevel := ctx.DebugLevel
-	logger := ctx.GetLogger()
-
 	actualPlatform := ctx.ActualPlatform
 	platform := ctx.TargetPlatform
 	if actualPlatform != platform {
@@ -74,20 +69,6 @@ func (s *LibrariesLoader) Run(ctx *types.Context) error {
 		}
 	}
 
-	if debugLevel > 0 {
-		for _, lib := range lm.Libraries {
-			for _, libAlt := range lib.Alternatives {
-				warnings, err := libAlt.Lint()
-				if err != nil {
-					return errors.WithStack(err)
-				}
-				for _, warning := range warnings {
-					logger.Fprintln(os.Stdout, "warn", warning)
-				}
-			}
-		}
-	}
-
 	resolver := librariesresolver.NewCppResolver()
 	if err := resolver.ScanFromLibrariesManager(lm); err != nil {
 		return errors.WithStack(err)
diff --git a/legacy/builder/merge_sketch_with_bootloader.go b/legacy/builder/merge_sketch_with_bootloader.go
index f8ec29757b0..377b5a9f697 100644
--- a/legacy/builder/merge_sketch_with_bootloader.go
+++ b/legacy/builder/merge_sketch_with_bootloader.go
@@ -22,7 +22,6 @@ import (
 
 	"github.com/arduino/arduino-cli/legacy/builder/constants"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
-	"github.com/arduino/arduino-cli/legacy/builder/utils"
 	"github.com/arduino/go-paths-helper"
 	"github.com/marcinbor85/gohex"
 	"github.com/pkg/errors"
@@ -66,7 +65,9 @@ func (s *MergeSketchWithBootloader) Run(ctx *types.Context) error {
 
 	bootloaderPath := buildProperties.GetPath(constants.BUILD_PROPERTIES_RUNTIME_PLATFORM_PATH).Join(constants.FOLDER_BOOTLOADERS, bootloader)
 	if bootloaderPath.NotExist() {
-		utils.LogIfVerbose(constants.LOG_LEVEL_WARN, tr("Bootloader file specified but missing: {0}"), bootloaderPath)
+		if ctx.Verbose {
+			ctx.Warn(tr("Bootloader file specified but missing: %[1]s", bootloaderPath))
+		}
 		return nil
 	}
 
@@ -79,8 +80,8 @@ func (s *MergeSketchWithBootloader) Run(ctx *types.Context) error {
 		maximumBinSize *= 2
 	}
 	err := merge(builtSketchPath, bootloaderPath, mergedSketchPath, maximumBinSize)
-	if err != nil {
-		utils.LogIfVerbose(constants.LOG_LEVEL_INFO, err.Error())
+	if err != nil && ctx.Verbose {
+		ctx.Info(err.Error())
 	}
 
 	return nil
diff --git a/legacy/builder/phases/core_builder.go b/legacy/builder/phases/core_builder.go
index 9d5caaa6914..c1c8a2fb63c 100644
--- a/legacy/builder/phases/core_builder.go
+++ b/legacy/builder/phases/core_builder.go
@@ -44,9 +44,8 @@ func (s *CoreBuilder) Run(ctx *types.Context) error {
 
 	if coreBuildCachePath != nil {
 		if _, err := coreBuildCachePath.RelTo(ctx.BuildPath); err != nil {
-			logger := ctx.GetLogger()
-			logger.Println(constants.LOG_LEVEL_INFO, tr("Couldn't deeply cache core build: {0}"), err)
-			logger.Println(constants.LOG_LEVEL_INFO, tr("Running normal build of the core..."))
+			ctx.Info(tr("Couldn't deeply cache core build: %[1]s", err))
+			ctx.Info(tr("Running normal build of the core..."))
 			coreBuildCachePath = nil
 			ctx.CoreBuildCachePath = nil
 		} else if err := coreBuildCachePath.MkdirAll(); err != nil {
@@ -66,7 +65,6 @@ func (s *CoreBuilder) Run(ctx *types.Context) error {
 }
 
 func compileCore(ctx *types.Context, buildPath *paths.Path, buildCachePath *paths.Path, buildProperties *properties.Map) (*paths.Path, paths.PathList, error) {
-	logger := ctx.GetLogger()
 	coreFolder := buildProperties.GetPath("build.core.path")
 	variantFolder := buildProperties.GetPath("build.variant.path")
 
@@ -104,7 +102,7 @@ func compileCore(ctx *types.Context, buildPath *paths.Path, buildCachePath *path
 		if canUseArchivedCore {
 			// use archived core
 			if ctx.Verbose {
-				logger.Println(constants.LOG_LEVEL_INFO, tr("Using precompiled core: {0}"), targetArchivedCore)
+				ctx.Info(tr("Using precompiled core: %[1]s", targetArchivedCore))
 			}
 			return targetArchivedCore, variantObjectFiles, nil
 		}
@@ -125,15 +123,13 @@ func compileCore(ctx *types.Context, buildPath *paths.Path, buildCachePath *path
 		err := archiveFile.CopyTo(targetArchivedCore)
 		if ctx.Verbose {
 			if err == nil {
-				logger.Println(constants.LOG_LEVEL_INFO, tr("Archiving built core (caching) in: {0}"), targetArchivedCore)
+				ctx.Info(tr("Archiving built core (caching) in: %[1]s", targetArchivedCore))
 			} else if os.IsNotExist(err) {
-				logger.Println(
-					constants.LOG_LEVEL_INFO,
-					tr("Unable to cache built core, please tell {0} maintainers to follow %s",
-						"https://arduino.github.io/arduino-cli/latest/platform-specification/#recipes-to-build-the-corea-archive-file"),
-					ctx.ActualPlatform)
+				ctx.Info(tr("Unable to cache built core, please tell %[1]s maintainers to follow %[2]s",
+					ctx.ActualPlatform,
+					"https://arduino.github.io/arduino-cli/latest/platform-specification/#recipes-to-build-the-corea-archive-file"))
 			} else {
-				logger.Println(constants.LOG_LEVEL_INFO, tr("Error archiving built core (caching) in {0}: {1}"), targetArchivedCore, err)
+				ctx.Info(tr("Error archiving built core (caching) in %[1]s: %[2]s", targetArchivedCore, err))
 			}
 		}
 	}
diff --git a/legacy/builder/phases/libraries_builder.go b/legacy/builder/phases/libraries_builder.go
index 7253c8a67e9..b19363db01f 100644
--- a/legacy/builder/phases/libraries_builder.go
+++ b/legacy/builder/phases/libraries_builder.go
@@ -16,7 +16,6 @@
 package phases
 
 import (
-	"os"
 	"strings"
 
 	"github.com/arduino/arduino-cli/arduino/libraries"
@@ -87,26 +86,25 @@ func findExpectedPrecompiledLibFolder(ctx *types.Context, library *libraries.Lib
 		}
 	}
 
-	logger := ctx.GetLogger()
-	logger.Fprintln(os.Stdout, constants.LOG_LEVEL_INFO, tr("Library {0} has been declared precompiled:"), library.Name)
+	ctx.Info(tr("Library %[1]s has been declared precompiled:", library.Name))
 
 	// Try directory with full fpuSpecs first, if available
 	if len(fpuSpecs) > 0 {
 		fpuSpecs = strings.TrimRight(fpuSpecs, "-")
 		fullPrecompDir := library.SourceDir.Join(mcu).Join(fpuSpecs)
 		if fullPrecompDir.Exist() && directoryContainsFile(fullPrecompDir) {
-			logger.Fprintln(os.Stdout, constants.LOG_LEVEL_INFO, tr("Using precompiled library in {0}"), fullPrecompDir)
+			ctx.Info(tr("Using precompiled library in %[1]s", fullPrecompDir))
 			return fullPrecompDir
 		}
-		logger.Fprintln(os.Stdout, constants.LOG_LEVEL_INFO, tr("Precompiled library in \"{0}\" not found"), fullPrecompDir)
+		ctx.Info(tr(`Precompiled library in "%[1]s" not found`, fullPrecompDir))
 	}
 
 	precompDir := library.SourceDir.Join(mcu)
 	if precompDir.Exist() && directoryContainsFile(precompDir) {
-		logger.Fprintln(os.Stdout, constants.LOG_LEVEL_INFO, tr("Using precompiled library in {0}"), precompDir)
+		ctx.Info(tr("Using precompiled library in %[1]s", precompDir))
 		return precompDir
 	}
-	logger.Fprintln(os.Stdout, constants.LOG_LEVEL_INFO, tr("Precompiled library in \"{0}\" not found"), precompDir)
+	ctx.Info(tr(`Precompiled library in "%[1]s" not found`, precompDir))
 	return nil
 }
 
@@ -130,9 +128,8 @@ func compileLibraries(ctx *types.Context, libraries libraries.List, buildPath *p
 }
 
 func compileLibrary(ctx *types.Context, library *libraries.Library, buildPath *paths.Path, buildProperties *properties.Map, includes []string) (paths.PathList, error) {
-	logger := ctx.GetLogger()
 	if ctx.Verbose {
-		logger.Println(constants.LOG_LEVEL_INFO, tr("Compiling library \"{0}\""), library.Name)
+		ctx.Info(tr(`Compiling library "%[1]s"`, library.Name))
 	}
 	libraryBuildPath := buildPath.Join(library.Name)
 
@@ -147,9 +144,7 @@ func compileLibrary(ctx *types.Context, library *libraries.Library, buildPath *p
 		precompiledPath := findExpectedPrecompiledLibFolder(ctx, library)
 
 		if !coreSupportPrecompiled {
-			logger := ctx.GetLogger()
-			logger.Fprintln(os.Stdout, constants.LOG_LEVEL_INFO, tr("The platform does not support '{0}' for precompiled libraries."), "compiler.libraries.ldflags")
-
+			ctx.Info(tr("The platform does not support '%[1]s' for precompiled libraries.", "compiler.libraries.ldflags"))
 		} else if precompiledPath != nil {
 			// Find all libraries in precompiledPath
 			libs, err := precompiledPath.ReadDir()
diff --git a/legacy/builder/phases/linker.go b/legacy/builder/phases/linker.go
index 5b1b4b1f7d7..a78762ebac0 100644
--- a/legacy/builder/phases/linker.go
+++ b/legacy/builder/phases/linker.go
@@ -32,7 +32,7 @@ type Linker struct{}
 func (s *Linker) Run(ctx *types.Context) error {
 	if ctx.OnlyUpdateCompilationDatabase {
 		if ctx.Verbose {
-			ctx.GetLogger().Println("info", tr("Skip linking of final executable."))
+			ctx.Info(tr("Skip linking of final executable."))
 		}
 		return nil
 	}
diff --git a/legacy/builder/phases/sizer.go b/legacy/builder/phases/sizer.go
index b4a372049b9..a23a8312ca2 100644
--- a/legacy/builder/phases/sizer.go
+++ b/legacy/builder/phases/sizer.go
@@ -51,8 +51,6 @@ func (s *Sizer) Run(ctx *types.Context) error {
 }
 
 func checkSize(ctx *types.Context, buildProperties *properties.Map) error {
-	logger := ctx.GetLogger()
-
 	properties := buildProperties.Clone()
 	properties.Set(constants.BUILD_PROPERTIES_COMPILER_WARNING_FLAGS, properties.Get(constants.BUILD_PROPERTIES_COMPILER_WARNING_FLAGS+"."+ctx.WarningsLevel))
 
@@ -78,26 +76,23 @@ func checkSize(ctx *types.Context, buildProperties *properties.Map) error {
 
 	textSize, dataSize, _, err := execSizeRecipe(ctx, properties)
 	if err != nil {
-		logger.Println(constants.LOG_LEVEL_WARN, tr("Couldn't determine program size"))
+		ctx.Warn(tr("Couldn't determine program size"))
 		return nil
 	}
 
-	logger.Println(constants.LOG_LEVEL_INFO,
-		tr("Sketch uses {0} bytes ({2}%%) of program storage space. Maximum is {1} bytes."),
+	ctx.Info(tr("Sketch uses %[1]s bytes (%[3]s%%) of program storage space. Maximum is %[2]s bytes.",
 		strconv.Itoa(textSize),
 		strconv.Itoa(maxTextSize),
-		strconv.Itoa(textSize*100/maxTextSize))
+		strconv.Itoa(textSize*100/maxTextSize)))
 	if dataSize >= 0 {
 		if maxDataSize > 0 {
-			logger.Println(constants.LOG_LEVEL_INFO,
-				tr("Global variables use {0} bytes ({2}%%) of dynamic memory, leaving {3} bytes for local variables. Maximum is {1} bytes."),
+			ctx.Info(tr("Global variables use %[1]s bytes (%[3]s%%) of dynamic memory, leaving %[4]s bytes for local variables. Maximum is %[2]s bytes.",
 				strconv.Itoa(dataSize),
 				strconv.Itoa(maxDataSize),
 				strconv.Itoa(dataSize*100/maxDataSize),
-				strconv.Itoa(maxDataSize-dataSize))
+				strconv.Itoa(maxDataSize-dataSize)))
 		} else {
-			logger.Println(constants.LOG_LEVEL_INFO,
-				tr("Global variables use {0} bytes of dynamic memory."), strconv.Itoa(dataSize))
+			ctx.Info(tr("Global variables use %[1]s bytes of dynamic memory.", strconv.Itoa(dataSize)))
 		}
 	}
 
@@ -117,14 +112,12 @@ func checkSize(ctx *types.Context, buildProperties *properties.Map) error {
 	}
 
 	if textSize > maxTextSize {
-		logger.Println(constants.LOG_LEVEL_ERROR,
-			tr("Sketch too big; see %s for tips on reducing it.", "https://support.arduino.cc/hc/en-us/articles/360013825179"))
+		ctx.Warn(tr("Sketch too big; see %[1]s for tips on reducing it.", "https://support.arduino.cc/hc/en-us/articles/360013825179"))
 		return errors.New(tr("text section exceeds available space in board"))
 	}
 
 	if maxDataSize > 0 && dataSize > maxDataSize {
-		logger.Println(constants.LOG_LEVEL_ERROR,
-			tr("Not enough memory; see %s for tips on reducing your footprint.", "https://support.arduino.cc/hc/en-us/articles/360013825179"))
+		ctx.Warn(tr("Not enough memory; see %[1]s for tips on reducing your footprint.", "https://support.arduino.cc/hc/en-us/articles/360013825179"))
 		return errors.New(tr("data section exceeds available space in board"))
 	}
 
@@ -134,7 +127,7 @@ func checkSize(ctx *types.Context, buildProperties *properties.Map) error {
 			return err
 		}
 		if maxDataSize > 0 && dataSize > maxDataSize*warnDataPercentage/100 {
-			logger.Println(constants.LOG_LEVEL_WARN, tr("Low memory available, stability problems may occur."))
+			ctx.Warn(tr("Low memory available, stability problems may occur."))
 		}
 	}
 
diff --git a/legacy/builder/preprocess_sketch.go b/legacy/builder/preprocess_sketch.go
index 8b272093b95..a252ae4900b 100644
--- a/legacy/builder/preprocess_sketch.go
+++ b/legacy/builder/preprocess_sketch.go
@@ -144,6 +144,6 @@ func (s *OutputCodeCompletions) Run(ctx *types.Context) error {
 		// we assume it is a json, let's make it compliant at least
 		ctx.CodeCompletions = "[]"
 	}
-	ctx.GetLogger().Println(constants.LOG_LEVEL_INFO, ctx.CodeCompletions)
+	fmt.Fprintln(ctx.Stdout, ctx.CodeCompletions)
 	return nil
 }
diff --git a/legacy/builder/print_used_and_not_used_libraries.go b/legacy/builder/print_used_and_not_used_libraries.go
index 96d7d507c3c..971036bea45 100644
--- a/legacy/builder/print_used_and_not_used_libraries.go
+++ b/legacy/builder/print_used_and_not_used_libraries.go
@@ -16,10 +16,10 @@
 package builder
 
 import (
-	"os"
+	"fmt"
+	"strings"
 	"time"
 
-	"github.com/arduino/arduino-cli/legacy/builder/constants"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
 )
 
@@ -29,32 +29,31 @@ type PrintUsedAndNotUsedLibraries struct {
 }
 
 func (s *PrintUsedAndNotUsedLibraries) Run(ctx *types.Context) error {
-	var logLevel string
-	// Print this message as warning when the sketch didn't compile,
-	// as info when we're verbose and not all otherwise
-	if s.SketchError {
-		logLevel = constants.LOG_LEVEL_WARN
-	} else if ctx.Verbose {
-		logLevel = constants.LOG_LEVEL_INFO
-	} else {
+	// Print this message:
+	// - as warning, when the sketch didn't compile
+	// - as info, when verbose is on
+	// - otherwise, output nothing
+	if !s.SketchError && !ctx.Verbose {
 		return nil
 	}
 
-	logger := ctx.GetLogger()
-	libraryResolutionResults := ctx.LibrariesResolutionResults
-
-	for header, libResResult := range libraryResolutionResults {
+	res := ""
+	for header, libResResult := range ctx.LibrariesResolutionResults {
 		if len(libResResult.NotUsedLibraries) == 0 {
 			continue
 		}
-		logger.Fprintln(os.Stdout, logLevel, tr("Multiple libraries were found for \"{0}\""), header)
-		logger.Fprintln(os.Stdout, logLevel, " "+tr("Used: {0}"), libResResult.Library.InstallDir)
+		res += fmt.Sprintln(tr(`Multiple libraries were found for "%[1]s"`, header))
+		res += fmt.Sprintln("  " + tr("Used: %[1]s", libResResult.Library.InstallDir))
 		for _, notUsedLibrary := range libResResult.NotUsedLibraries {
-			logger.Fprintln(os.Stdout, logLevel, " "+tr("Not used: {0}"), notUsedLibrary.InstallDir)
+			res += fmt.Sprintln("  " + tr("Not used: %[1]s", notUsedLibrary.InstallDir))
 		}
 	}
-
+	res = strings.TrimSpace(res)
+	if s.SketchError {
+		ctx.Warn(res)
+	} else {
+		ctx.Info(res)
+	}
 	time.Sleep(100 * time.Millisecond)
-
 	return nil
 }
diff --git a/legacy/builder/print_used_libraries_if_verbose.go b/legacy/builder/print_used_libraries_if_verbose.go
index 409fb18eb18..8c32c925995 100644
--- a/legacy/builder/print_used_libraries_if_verbose.go
+++ b/legacy/builder/print_used_libraries_if_verbose.go
@@ -18,17 +18,13 @@ package builder
 import (
 	"time"
 
-	"github.com/arduino/arduino-cli/legacy/builder/constants"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
 )
 
 type PrintUsedLibrariesIfVerbose struct{}
 
 func (s *PrintUsedLibrariesIfVerbose) Run(ctx *types.Context) error {
-	verbose := ctx.Verbose
-	logger := ctx.GetLogger()
-
-	if !verbose || len(ctx.ImportedLibraries) == 0 {
+	if !ctx.Verbose || len(ctx.ImportedLibraries) == 0 {
 		return nil
 	}
 
@@ -38,22 +34,21 @@ func (s *PrintUsedLibrariesIfVerbose) Run(ctx *types.Context) error {
 			legacy = tr("(legacy)")
 		}
 		if library.Version.String() == "" {
-			logger.Println(constants.LOG_LEVEL_INFO,
-				tr("Using library {0} in folder: {1} {2}"),
-				library.Name,
-				library.InstallDir,
-				legacy)
+			ctx.Info(
+				tr("Using library %[1]s in folder: %[2]s %[3]s",
+					library.Name,
+					library.InstallDir,
+					legacy))
 		} else {
-			logger.Println(constants.LOG_LEVEL_INFO,
-				tr("Using library {0} at version {1} in folder: {2} {3}"),
-				library.Name,
-				library.Version,
-				library.InstallDir,
-				legacy)
+			ctx.Info(
+				tr("Using library %[1]s at version %[2]s in folder: %[3]s %[4]s",
+					library.Name,
+					library.Version,
+					library.InstallDir,
+					legacy))
 		}
 	}
 
 	time.Sleep(100 * time.Millisecond)
-
 	return nil
 }
diff --git a/legacy/builder/recipe_runner.go b/legacy/builder/recipe_runner.go
index a9ce71de39e..6dfb914d7b9 100644
--- a/legacy/builder/recipe_runner.go
+++ b/legacy/builder/recipe_runner.go
@@ -16,16 +16,16 @@
 package builder
 
 import (
-	"os"
+	"fmt"
 	"sort"
 	"strings"
 
 	"github.com/arduino/arduino-cli/legacy/builder/builder_utils"
-	"github.com/arduino/arduino-cli/legacy/builder/constants"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
 	"github.com/arduino/arduino-cli/legacy/builder/utils"
 	properties "github.com/arduino/go-properties-orderedmap"
 	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
 )
 
 type RecipeByPrefixSuffixRunner struct {
@@ -35,19 +35,14 @@ type RecipeByPrefixSuffixRunner struct {
 }
 
 func (s *RecipeByPrefixSuffixRunner) Run(ctx *types.Context) error {
-	logger := ctx.GetLogger()
-	if ctx.DebugLevel >= 10 {
-		logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("Looking for recipes like {0}*{1}"), s.Prefix, s.Suffix)
-	}
+	logrus.Debugf(fmt.Sprintf("Looking for recipes like %s", s.Prefix+"*"+s.Suffix))
 
 	buildProperties := ctx.BuildProperties.Clone()
 	recipes := findRecipes(buildProperties, s.Prefix, s.Suffix)
 
 	properties := buildProperties.Clone()
 	for _, recipe := range recipes {
-		if ctx.DebugLevel >= 10 {
-			logger.Fprintln(os.Stdout, constants.LOG_LEVEL_DEBUG, tr("Running recipe: {0}"), recipe)
-		}
+		logrus.Debugf(fmt.Sprintf("Running recipe: %s", recipe))
 
 		command, err := builder_utils.PrepareCommandForRecipe(properties, recipe, false)
 		if err != nil {
@@ -56,7 +51,7 @@ func (s *RecipeByPrefixSuffixRunner) Run(ctx *types.Context) error {
 
 		if ctx.OnlyUpdateCompilationDatabase && s.SkipIfOnlyUpdatingCompilationDatabase {
 			if ctx.Verbose {
-				ctx.GetLogger().Println("info", tr("Skipping: {0}"), strings.Join(command.Args, " "))
+				ctx.Info(tr("Skipping: %[1]s", strings.Join(command.Args, " ")))
 			}
 			return nil
 		}
diff --git a/legacy/builder/resolve_library.go b/legacy/builder/resolve_library.go
index 9d9a9781e25..3cb3c07aee3 100644
--- a/legacy/builder/resolve_library.go
+++ b/legacy/builder/resolve_library.go
@@ -19,7 +19,6 @@ import (
 	"fmt"
 
 	"github.com/arduino/arduino-cli/arduino/libraries"
-	"github.com/arduino/arduino-cli/legacy/builder/constants"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
 )
 
@@ -29,11 +28,10 @@ func ResolveLibrary(ctx *types.Context, header string) *libraries.Library {
 
 	candidates := resolver.AlternativesFor(header)
 
-	logger := ctx.GetLogger()
 	if ctx.Verbose {
-		logger.Println(constants.LOG_LEVEL_INFO, tr("Alternatives for %[1]s: %[2]s", header, candidates))
-		logger.Println(constants.LOG_LEVEL_INFO, fmt.Sprintf("ResolveLibrary(%s)", header))
-		logger.Println(constants.LOG_LEVEL_INFO, fmt.Sprintf("  -> %s: %s", tr("candidates"), candidates))
+		ctx.Info(tr("Alternatives for %[1]s: %[2]s", header, candidates))
+		ctx.Info(fmt.Sprintf("ResolveLibrary(%s)", header))
+		ctx.Info(fmt.Sprintf("  -> %s: %s", tr("candidates"), candidates))
 	}
 
 	if candidates == nil || len(candidates) == 0 {
diff --git a/legacy/builder/target_board_resolver.go b/legacy/builder/target_board_resolver.go
index 81dada3273a..6e1f2f7d5d0 100644
--- a/legacy/builder/target_board_resolver.go
+++ b/legacy/builder/target_board_resolver.go
@@ -16,21 +16,18 @@
 package builder
 
 import (
+	"fmt"
 	"strings"
 
-	"github.com/arduino/arduino-cli/legacy/builder/constants"
-	"github.com/arduino/arduino-cli/legacy/builder/i18n"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
 )
 
 type TargetBoardResolver struct{}
 
 func (s *TargetBoardResolver) Run(ctx *types.Context) error {
-	logger := ctx.GetLogger()
-
 	targetPackage, targetPlatform, targetBoard, buildProperties, actualPlatform, err := ctx.PackageManager.ResolveFQBN(ctx.FQBN)
 	if err != nil {
-		return i18n.ErrorfWithLogger(logger, tr("Error resolving FQBN: {0}"), err)
+		return fmt.Errorf("%s: %w", tr("Error resolving FQBN"), err)
 	}
 
 	targetBoard.Properties = buildProperties // FIXME....
@@ -43,14 +40,8 @@ func (s *TargetBoardResolver) Run(ctx *types.Context) error {
 	core = core[strings.Index(core, ":")+1:]
 
 	if ctx.Verbose {
-		logger.Println(constants.LOG_LEVEL_INFO,
-			tr("Using board '{0}' from platform in folder: {1}"),
-			targetBoard.BoardID,
-			targetPlatform.InstallDir)
-		logger.Println(constants.LOG_LEVEL_INFO,
-			tr("Using core '{0}' from platform in folder: {1}"),
-			core,
-			actualPlatform.InstallDir)
+		ctx.Info(tr("Using board '%[1]s' from platform in folder: %[2]s", targetBoard.BoardID, targetPlatform.InstallDir))
+		ctx.Info(tr("Using core '%[1]s' from platform in folder: %[2]s", core, actualPlatform.InstallDir))
 	}
 
 	ctx.BuildCore = core
diff --git a/legacy/builder/test/builder_test.go b/legacy/builder/test/builder_test.go
index 7bc35b46a39..31570f21277 100644
--- a/legacy/builder/test/builder_test.go
+++ b/legacy/builder/test/builder_test.go
@@ -47,7 +47,6 @@ func TestBuilderEmptySketch(t *testing.T) {
 	DownloadCoresAndToolsAndLibraries(t)
 
 	ctx := prepareBuilderTestContext(t, paths.New("sketch1", "sketch1.ino"), "arduino:avr:uno")
-	ctx.DebugLevel = 10
 
 	buildPath := SetupBuildPath(t, ctx)
 	defer buildPath.RemoveAll()
diff --git a/legacy/builder/test/create_build_options_map_test.go b/legacy/builder/test/create_build_options_map_test.go
index 3abb60eca0a..9cc72379d14 100644
--- a/legacy/builder/test/create_build_options_map_test.go
+++ b/legacy/builder/test/create_build_options_map_test.go
@@ -34,7 +34,6 @@ func TestCreateBuildOptionsMap(t *testing.T) {
 		ArduinoAPIVersion:  "ideVersion",
 		Verbose:            true,
 		BuildPath:          paths.New("buildPath"),
-		DebugLevel:         5,
 		OptimizationFlags:  "-Os",
 	}
 
diff --git a/legacy/builder/test/i18n_test.go b/legacy/builder/test/i18n_test.go
deleted file mode 100644
index f6866ca73fd..00000000000
--- a/legacy/builder/test/i18n_test.go
+++ /dev/null
@@ -1,59 +0,0 @@
-// This file is part of arduino-cli.
-//
-// Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
-//
-// This software is released under the GNU General Public License version 3,
-// which covers the main part of arduino-cli.
-// The terms of this license can be found at:
-// https://www.gnu.org/licenses/gpl-3.0.en.html
-//
-// You can be released from the requirements of the above licenses by purchasing
-// a commercial license. Buying such a license is mandatory if you want to
-// modify or otherwise use the software for commercial activities involving the
-// Arduino software without disclosing the source code of your own applications.
-// To purchase a commercial license, send an email to license@arduino.cc.
-
-package test
-
-import (
-	"fmt"
-	"testing"
-
-	"github.com/arduino/arduino-cli/legacy/builder/constants"
-	"github.com/arduino/arduino-cli/legacy/builder/i18n"
-	"github.com/stretchr/testify/require"
-)
-
-func TestI18NSyntax(t *testing.T) {
-	require.Equal(t, "Do you want to remove %[1]v?\nIf you do so you won't be able to use %[1]v any more.", i18n.FromJavaToGoSyntax("Do you want to remove {0}?\nIf you do so you won't be able to use {0} any more."))
-	require.Equal(t, "A file named \"%[1]v\" already exists in \"%[2]v\"", i18n.FromJavaToGoSyntax("A file named \"{0}\" already exists in \"{1}\""))
-	require.Equal(t, "Board %[1]v:%[2]v:%[3]v doesn't define a 'build.board' preference. Auto-set to: %[4]v", i18n.FromJavaToGoSyntax("Board {0}:{1}:{2} doesn''t define a ''build.board'' preference. Auto-set to: {3}"))
-
-	require.Equal(t, "22 11\n", fmt.Sprintf("%[2]d %[1]d\n", 11, 22))
-	require.Equal(t, "d c b a", i18n.Format("{3} {2} {1} {0}", "a", "b", "c", "d"))
-
-	require.Equal(t, "e d b a", i18n.Format("{4} {3} {1} {0}", "a", "b", "c", "d", "e"))
-
-	require.Equal(t, "a b", i18n.Format("{0} {1}", "a", "b", "c", "d", "e"))
-
-	require.Equal(t, "%!v(BADINDEX) c b a", i18n.Format("{3} {2} {1} {0}", "a", "b", "c"))
-	require.Equal(t, "%!v(BADINDEX) %!v(BADINDEX) %!v(BADINDEX) %!v(BADINDEX)", i18n.Format("{3} {2} {1} {0}"))
-
-	require.Equal(t, "I'm %[1]v%% sure", i18n.FromJavaToGoSyntax("I'm {0}%% sure"))
-	require.Equal(t, "I'm 100% sure", i18n.Format("I'm {0}%% sure", 100))
-
-	require.Equal(t, "Either in [1] or in [2]", i18n.Format("Either in [{0}] or in [{1}]", 1, 2))
-
-	require.Equal(t, "Using library a at version b in folder: c ", i18n.Format("Using library {0} at version {1} in folder: {2} {3}", "a", "b", "c", ""))
-
-	require.Equal(t, "Missing 'a' from library in b", i18n.Format("Missing '{0}' from library in {1}", "a", "b"))
-}
-
-func TestI18NInheritance(t *testing.T) {
-	var logger i18n.Logger
-	logger = &i18n.HumanLogger{}
-	logger.Println(constants.LOG_LEVEL_INFO, "good {0} {1}", "morning", "vietnam!")
-
-	logger = &i18n.MachineLogger{}
-	logger.Println(constants.LOG_LEVEL_INFO, "good {0} {1}", "morning", "vietnam!")
-}
diff --git a/legacy/builder/test/prototypes_adder_test.go b/legacy/builder/test/prototypes_adder_test.go
index 1e2e706870e..5025f199d82 100644
--- a/legacy/builder/test/prototypes_adder_test.go
+++ b/legacy/builder/test/prototypes_adder_test.go
@@ -48,8 +48,6 @@ func TestPrototypesAdderBridgeExample(t *testing.T) {
 	buildPath := SetupBuildPath(t, ctx)
 	defer buildPath.RemoveAll()
 
-	ctx.DebugLevel = 10
-
 	commands := []types.Command{
 
 		&builder.ContainerSetupHardwareToolsLibsSketchAndProps{},
diff --git a/legacy/builder/test/store_build_options_map_test.go b/legacy/builder/test/store_build_options_map_test.go
index f3aa0b7ba79..56c1913d7ee 100644
--- a/legacy/builder/test/store_build_options_map_test.go
+++ b/legacy/builder/test/store_build_options_map_test.go
@@ -36,7 +36,6 @@ func TestStoreBuildOptionsMap(t *testing.T) {
 		ArduinoAPIVersion:     "ideVersion",
 		CustomBuildProperties: []string{"custom=prop"},
 		Verbose:               true,
-		DebugLevel:            5,
 		OptimizationFlags:     "-Os",
 	}
 
diff --git a/legacy/builder/types/context.go b/legacy/builder/types/context.go
index 5f8a92b2259..77610afbb8e 100644
--- a/legacy/builder/types/context.go
+++ b/legacy/builder/types/context.go
@@ -16,9 +16,13 @@
 package types
 
 import (
+	"fmt"
 	"io"
+	"os"
 	"strings"
+	"sync"
 
+	"github.com/arduino/arduino-cli/arduino"
 	"github.com/arduino/arduino-cli/arduino/builder"
 	"github.com/arduino/arduino-cli/arduino/cores"
 	"github.com/arduino/arduino-cli/arduino/cores/packagemanager"
@@ -27,7 +31,6 @@ import (
 	"github.com/arduino/arduino-cli/arduino/libraries/librariesresolver"
 	"github.com/arduino/arduino-cli/arduino/sketch"
 	"github.com/arduino/arduino-cli/commands"
-	"github.com/arduino/arduino-cli/legacy/builder/i18n"
 	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
 	paths "github.com/arduino/go-paths-helper"
 	properties "github.com/arduino/go-properties-orderedmap"
@@ -150,10 +153,6 @@ type Context struct {
 	// Contents of a custom build properties file (line by line)
 	CustomBuildProperties []string
 
-	// Logging
-	logger     i18n.Logger
-	DebugLevel int
-
 	// Reuse old tools since the backing storage didn't change
 	CanUseCachedTools bool
 
@@ -163,9 +162,10 @@ type Context struct {
 	// Parallel processes
 	Jobs int
 
-	// Out and Err stream to redirect all Exec commands
-	ExecStdout io.Writer
-	ExecStderr io.Writer
+	// Out and Err stream to redirect all output
+	Stdout  io.Writer
+	Stderr  io.Writer
+	stdLock sync.Mutex
 
 	// Sizer results
 	ExecutableSectionsSize ExecutablesFileSections
@@ -238,7 +238,7 @@ func (ctx *Context) InjectBuildOptions(opts *properties.Map) {
 	ctx.SketchLocation = opts.GetPath("sketchLocation")
 	fqbn, err := cores.ParseFQBN(opts.Get("fqbn"))
 	if err != nil {
-		i18n.ErrorfWithLogger(ctx.GetLogger(), tr("Error in FQBN: %s"), err)
+		fmt.Fprintln(ctx.Stderr, &arduino.InvalidFQBNError{Cause: err})
 	}
 	ctx.FQBN = fqbn
 	ctx.ArduinoAPIVersion = opts.Get("runtime.ide.version")
@@ -246,19 +246,28 @@ func (ctx *Context) InjectBuildOptions(opts *properties.Map) {
 	ctx.OptimizationFlags = opts.Get("compiler.optimization_flags")
 }
 
-func (ctx *Context) GetLogger() i18n.Logger {
-	if ctx.logger == nil {
-		return &i18n.HumanLogger{}
+func (ctx *Context) PushProgress() {
+	if ctx.ProgressCB != nil {
+		ctx.ProgressCB(&rpc.TaskProgress{Percent: ctx.Progress.Progress})
 	}
-	return ctx.logger
 }
 
-func (ctx *Context) SetLogger(l i18n.Logger) {
-	ctx.logger = l
+func (ctx *Context) Info(msg string) {
+	ctx.stdLock.Lock()
+	if ctx.Stdout == nil {
+		fmt.Fprintln(os.Stdout, msg)
+	} else {
+		fmt.Fprintln(ctx.Stdout, msg)
+	}
+	ctx.stdLock.Unlock()
 }
 
-func (ctx *Context) PushProgress() {
-	if ctx.ProgressCB != nil {
-		ctx.ProgressCB(&rpc.TaskProgress{Percent: ctx.Progress.Progress})
+func (ctx *Context) Warn(msg string) {
+	ctx.stdLock.Lock()
+	if ctx.Stderr == nil {
+		fmt.Fprintln(os.Stderr, msg)
+	} else {
+		fmt.Fprintln(ctx.Stderr, msg)
 	}
+	ctx.stdLock.Unlock()
 }
diff --git a/legacy/builder/types/types.go b/legacy/builder/types/types.go
index c4e3625e599..70ee1c34608 100644
--- a/legacy/builder/types/types.go
+++ b/legacy/builder/types/types.go
@@ -21,12 +21,9 @@ import (
 
 	"github.com/arduino/arduino-cli/arduino/libraries"
 	"github.com/arduino/arduino-cli/arduino/sketch"
-	"github.com/arduino/arduino-cli/i18n"
 	paths "github.com/arduino/go-paths-helper"
 )
 
-var tr = i18n.Tr
-
 type SourceFile struct {
 	// Sketch or Library pointer that this source file lives in
 	Origin interface{}
diff --git a/legacy/builder/utils/utils.go b/legacy/builder/utils/utils.go
index e8feb19ddf2..2f60ff75719 100644
--- a/legacy/builder/utils/utils.go
+++ b/legacy/builder/utils/utils.go
@@ -175,29 +175,29 @@ const (
 )
 
 func ExecCommand(ctx *types.Context, command *exec.Cmd, stdout int, stderr int) ([]byte, []byte, error) {
-	if ctx.ExecStdout == nil {
-		ctx.ExecStdout = os.Stdout
+	if ctx.Stdout == nil {
+		ctx.Stdout = os.Stdout
 	}
-	if ctx.ExecStderr == nil {
-		ctx.ExecStderr = os.Stderr
+	if ctx.Stderr == nil {
+		ctx.Stderr = os.Stderr
 	}
 
 	if ctx.Verbose {
-		ctx.GetLogger().Println("info", "{0}", PrintableCommand(command.Args))
+		ctx.Info(PrintableCommand(command.Args))
 	}
 
 	if stdout == Capture {
 		buffer := &bytes.Buffer{}
 		command.Stdout = buffer
 	} else if stdout == Show || stdout == ShowIfVerbose && ctx.Verbose {
-		command.Stdout = ctx.ExecStdout
+		command.Stdout = ctx.Stdout
 	}
 
 	if stderr == Capture {
 		buffer := &bytes.Buffer{}
 		command.Stderr = buffer
 	} else if stderr == Show || stderr == ShowIfVerbose && ctx.Verbose {
-		command.Stderr = ctx.ExecStderr
+		command.Stderr = ctx.Stderr
 	}
 
 	err := command.Start()
@@ -317,20 +317,23 @@ func MD5Sum(data []byte) string {
 
 type loggerAction struct {
 	onlyIfVerbose bool
-	level         string
-	format        string
-	args          []interface{}
+	warn          bool
+	msg           string
 }
 
 func (l *loggerAction) Run(ctx *types.Context) error {
 	if !l.onlyIfVerbose || ctx.Verbose {
-		ctx.GetLogger().Println(l.level, l.format, l.args...)
+		if l.warn {
+			ctx.Warn(l.msg)
+		} else {
+			ctx.Info(l.msg)
+		}
 	}
 	return nil
 }
 
-func LogIfVerbose(level string, format string, args ...interface{}) types.Command {
-	return &loggerAction{true, level, format, args}
+func LogIfVerbose(warn bool, msg string) types.Command {
+	return &loggerAction{onlyIfVerbose: true, warn: warn, msg: msg}
 }
 
 // Returns the given string as a quoted string for use with the C
diff --git a/legacy/builder/warn_about_arch_incompatible_libraries.go b/legacy/builder/warn_about_arch_incompatible_libraries.go
index 72103ae8afa..712f79b2fe5 100644
--- a/legacy/builder/warn_about_arch_incompatible_libraries.go
+++ b/legacy/builder/warn_about_arch_incompatible_libraries.go
@@ -16,7 +16,6 @@
 package builder
 
 import (
-	"os"
 	"strings"
 
 	"github.com/arduino/arduino-cli/legacy/builder/constants"
@@ -26,13 +25,8 @@ import (
 type WarnAboutArchIncompatibleLibraries struct{}
 
 func (s *WarnAboutArchIncompatibleLibraries) Run(ctx *types.Context) error {
-	if ctx.DebugLevel < 0 {
-		return nil
-	}
-
 	targetPlatform := ctx.TargetPlatform
 	buildProperties := ctx.BuildProperties
-	logger := ctx.GetLogger()
 
 	archs := []string{targetPlatform.Platform.Architecture}
 	if overrides, ok := buildProperties.GetOk(constants.BUILD_PROPERTIES_ARCH_OVERRIDE_CHECK); ok {
@@ -41,12 +35,11 @@ func (s *WarnAboutArchIncompatibleLibraries) Run(ctx *types.Context) error {
 
 	for _, importedLibrary := range ctx.ImportedLibraries {
 		if !importedLibrary.SupportsAnyArchitectureIn(archs...) {
-			logger.Fprintln(os.Stdout,
-				constants.LOG_LEVEL_WARN,
-				tr("WARNING: library {0} claims to run on {1} architecture(s) and may be incompatible with your current board which runs on {2} architecture(s)."),
-				importedLibrary.Name,
-				strings.Join(importedLibrary.Architectures, ", "),
-				strings.Join(archs, ", "))
+			ctx.Info(
+				tr("WARNING: library %[1]s claims to run on %[2]s architecture(s) and may be incompatible with your current board which runs on %[3]s architecture(s).",
+					importedLibrary.Name,
+					strings.Join(importedLibrary.Architectures, ", "),
+					strings.Join(archs, ", ")))
 		}
 	}
 
diff --git a/legacy/builder/warn_about_platform_rewrites.go b/legacy/builder/warn_about_platform_rewrites.go
index edf19a5266f..6349ff9e276 100644
--- a/legacy/builder/warn_about_platform_rewrites.go
+++ b/legacy/builder/warn_about_platform_rewrites.go
@@ -16,8 +16,6 @@
 package builder
 
 import (
-	"os"
-
 	"github.com/arduino/arduino-cli/arduino/cores"
 	"github.com/arduino/arduino-cli/legacy/builder/constants"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
@@ -26,11 +24,6 @@ import (
 type WarnAboutPlatformRewrites struct{}
 
 func (s *WarnAboutPlatformRewrites) Run(ctx *types.Context) error {
-	if ctx.DebugLevel < 0 {
-		return nil
-	}
-
-	logger := ctx.GetLogger()
 	hardwareRewriteResults := ctx.HardwareRewriteResults
 	targetPlatform := ctx.TargetPlatform
 	actualPlatform := ctx.ActualPlatform
@@ -43,11 +36,11 @@ func (s *WarnAboutPlatformRewrites) Run(ctx *types.Context) error {
 	for _, platform := range platforms {
 		if hardwareRewriteResults[platform] != nil {
 			for _, rewrite := range hardwareRewriteResults[platform] {
-				logger.Fprintln(os.Stdout, constants.LOG_LEVEL_WARN,
-					tr("Warning: platform.txt from core '{0}' contains deprecated {1}, automatically converted to {2}. Consider upgrading this core."),
-					platform.Properties.Get(constants.PLATFORM_NAME),
-					rewrite.Key+"="+rewrite.OldValue,
-					rewrite.Key+"="+rewrite.NewValue)
+				ctx.Info(
+					tr("Warning: platform.txt from core '%[1]s' contains deprecated %[2]s, automatically converted to %[3]s. Consider upgrading this core.",
+						platform.Properties.Get(constants.PLATFORM_NAME),
+						rewrite.Key+"="+rewrite.OldValue,
+						rewrite.Key+"="+rewrite.NewValue))
 			}
 		}
 	}
diff --git a/legacy/builder/wipeout_build_path_if_build_options_changed.go b/legacy/builder/wipeout_build_path_if_build_options_changed.go
index c2263ac9591..44e5207a619 100644
--- a/legacy/builder/wipeout_build_path_if_build_options_changed.go
+++ b/legacy/builder/wipeout_build_path_if_build_options_changed.go
@@ -46,7 +46,7 @@ func (s *WipeoutBuildPathIfBuildOptionsChanged) Run(ctx *types.Context) error {
 
 	var prevOpts *properties.Map
 	if err := json.Unmarshal([]byte(previousBuildOptionsJson), &prevOpts); err != nil || prevOpts == nil {
-		ctx.GetLogger().Println(constants.LOG_LEVEL_DEBUG, tr("{0} invalid, rebuilding all"), constants.BUILD_OPTIONS_FILE)
+		ctx.Info(tr("%[1]s invalid, rebuilding all", constants.BUILD_OPTIONS_FILE))
 		return doCleanup(ctx.BuildPath)
 	}
 
diff --git a/test/test_compile_part_4.py b/test/test_compile_part_4.py
index b3ad168ca1c..7cc22813634 100644
--- a/test/test_compile_part_4.py
+++ b/test/test_compile_part_4.py
@@ -110,8 +110,8 @@ def test_compile_with_library_priority(run_command, data_dir):
     cli_installed_lib_path = Path(data_dir, "libraries", "WiFi101")
     expected_output = [
         'Multiple libraries were found for "WiFi101.h"',
-        f" Used: {manually_install_lib_path}",
-        f" Not used: {cli_installed_lib_path}",
+        f"  Used: {manually_install_lib_path}",
+        f"  Not used: {cli_installed_lib_path}",
     ]
     assert "\n".join(expected_output) in res.stdout
 
@@ -180,8 +180,8 @@ def test_compile_with_conflicting_libraries_include(run_command, data_dir, copy_
     assert res.ok
     expected_output = [
         'Multiple libraries were found for "OneWire.h"',
-        f" Used: {one_wire_lib_path}",
-        f" Not used: {one_wire_ng_lib_path}",
+        f"  Used: {one_wire_lib_path}",
+        f"  Not used: {one_wire_ng_lib_path}",
     ]
     assert "\n".join(expected_output) in res.stdout
 
@@ -245,8 +245,8 @@ def test_compile_with_esp32_bundled_libraries(run_command, data_dir, copy_sketch
     cli_installed_lib_path = Path(data_dir, "libraries", "SD")
     expected_output = [
         'Multiple libraries were found for "SD.h"',
-        f" Used: {core_bundled_lib_path}",
-        f" Not used: {cli_installed_lib_path}",
+        f"  Used: {core_bundled_lib_path}",
+        f"  Not used: {cli_installed_lib_path}",
     ]
     assert "\n".join(expected_output) not in res.stdout
 
@@ -286,8 +286,8 @@ def test_compile_with_esp8266_bundled_libraries(run_command, data_dir, copy_sket
     cli_installed_lib_path = Path(data_dir, "libraries", "SD")
     expected_output = [
         'Multiple libraries were found for "SD.h"',
-        f" Used: {core_bundled_lib_path}",
-        f" Not used: {cli_installed_lib_path}",
+        f"  Used: {core_bundled_lib_path}",
+        f"  Not used: {cli_installed_lib_path}",
     ]
     assert "\n".join(expected_output) not in res.stdout