"flutter pub get" Missing extension byte (at offset 18)

[Z6P0]

flutter pub get

Resolving dependencies... (4.2s)
Missing extension byte (at offset 18)
dart:isolate  _RawReceivePort._handleMessage

flutter doctor -v

[✓] Flutter (Channel stable, 3.35.1, on Ubuntu 22.04.5 LTS 5.15.0-151-generic,
    locale fr_FR.UTF-8) [42ms]
    • Flutter version 3.35.1 on channel stable at /opt/flutter_3.35.1
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 20f8274939 (il y a 16 heures), 2025-08-14 10:53:09
      -0700
    • Engine revision 1e9a811bf8
    • Dart version 3.9.0
    • DevTools version 2.48.0
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop,
      enable-windows-desktop, enable-android, enable-ios, cli-animations,
      enable-lldb-debugging

[✓] Android toolchain - develop for Android devices (Android SDK version
    36.0.0-rc1) [1 977ms]
    • Android SDK at /home/x/Android/Sdk
    • Emulator version 35.6.11.0 (build_id 13610412) (CL:N/A)
    • Platform android-36, build-tools 36.0.0-rc1
    • ANDROID_HOME = /home/x/Android/Sdk
    • Java binary at: /opt/android-studio-2025.1.1.13/jbr/bin/java
      This is the JDK bundled with the latest Android Studio installation on
      this machine.
      To manually set the JDK path, use: `flutter config
      --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.6+-13391695-b895.109)
    • All Android licenses accepted.

[✓] Chrome - develop for the web [14ms]
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop [160ms]
    • Ubuntu clang version 14.0.0-1ubuntu1.1
    • cmake version 3.22.1
    • ninja version 1.10.1
    • pkg-config version 0.29.2
    • GL_EXT_framebuffer_blit: no
    • GL_EXT_texture_format_BGRA8888: no

[✓] Android Studio (version 2025.1.1) [11ms]
    • Android Studio at /opt/android-studio-2025.1.1.13
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 21.0.6+-13391695-b895.109)

[✓] Connected device (2 available) [93ms]
    • Linux (desktop) • linux  • linux-x64      • Ubuntu 22.04.5 LTS
      5.15.0-151-generic
    • Chrome (web)    • chrome • web-javascript • Google Chrome 127.0.6533.119

[✓] Network resources [248ms]
    • All expected network resources are available.

• No issues found!

pub_log.txt

[sigurdm]

Hi - thanks for reporting. Not sure what is happening here. The error message is from utf-8 decoding (https://github.com/dart-lang/sdk/blob/f7f0f71a2eee0ebb96e06212815d3c3c0e3259e7/sdk/lib/convert/utf.dart#L531) but not sure what we are decoding.

Does this issue reproduce reliably? Is there any way you could reduce this to a reproduction we could look at?

[Z6P0]

After commenting out lines in pubspec.yaml, it appears that these lines caused the bug:

  workmanager:
    git:
      url: https://github.com/fluttercommunity/flutter_workmanager.git
      ref: b783000

[sigurdm]

I can resolve this pubspec.yaml without problems.

name: abc
environment:
  sdk: ^3.7.0
dependencies:
  workmanager:
    git:
      url: https://github.com/fluttercommunity/flutter_workmanager.git
      ref: b783000

[Feridinha]

Hello. Same problem happening here. My main Desktop cannot get git dependencies while my laptop can.

  mpris:
    git: https://github.com/feridinha/dart-mpris

If I manually run git clone and change to a path dependency it works just fine. Example:

  mpris:
    path: ../dart-mpris

[sigurdm]

@Feridinha

Does this issue reproduce reliably? Is there any way you could reduce this to a reproduction we could look at?

What are the differences between the Laptop and Desktop (os?)

[sigurdm]

@Feridinha

Could you try running flutter pub get --verbose and attaching the output?

[Feridinha]

@sigurdm
My laptop is running arch linux and my desktop is running fedora. I don't think I can make this bug reproducible, but here are the logs: (I created a brand new project using flutter create and then I added the dart-mpris as a git dependency)

flutter pub get --verbose

[  +17 ms] executing: uname -m
[   +4 ms] Exit code 0 from: uname -m
[        ] x86_64
[   +6 ms] Artifact Instance of 'MaterialFonts' is not required, skipping update.
[        ] Artifact Instance of 'GradleWrapper' is not required, skipping update.
[        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] Artifact Instance of 'LegacyCanvasKitRemover' is not required, skipping update.
[        ] Artifact Instance of 'FlutterSdk' is not required, skipping update.
[        ] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FontSubsetArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'PubDependencies' is not required, skipping update.
[  +15 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] Artifact Instance of 'FlutterEngineStamp' is not required, skipping update.
[        ] Artifact Instance of 'LegacyCanvasKitRemover' is not required, skipping update.
[   +1 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +22 ms] Artifact Instance of 'MaterialFonts' is not required, skipping update.
[        ] Artifact Instance of 'GradleWrapper' is not required, skipping update.
[        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] Artifact Instance of 'FlutterEngineStamp' is not required, skipping update.
[        ] Artifact Instance of 'LegacyCanvasKitRemover' is not required, skipping update.
[        ] Artifact Instance of 'FlutterSdk' is not required, skipping update.
[        ] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FontSubsetArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'PubDependencies' is not required, skipping update.
[  +15 ms] executing: [/home/myuser/projects/pub_git_dependency/] /home/myuser/flutter/bin/cache/dart-sdk/bin/dart pub --suppress-analytics
get --verbose --example --directory .
FINE: Pub 3.9.0
MSG : Resolving dependencies...
SLVR: fact: pub_git_dependency is 1.0.0+1
SLVR: derived: pub_git_dependency
SLVR: fact: pub_git_dependency depends on flutter from sdk
SLVR: fact: pub_git_dependency depends on mpris from git
SLVR: fact: pub_git_dependency depends on cupertino_icons ^1.0.8
SLVR: fact: pub_git_dependency depends on flutter_test from sdk
SLVR: fact: pub_git_dependency depends on flutter_lints ^5.0.0
SLVR:   selecting pub_git_dependency
SLVR:   derived: flutter_lints ^5.0.0
SLVR:   derived: flutter_test from sdk
SLVR:   derived: cupertino_icons ^1.0.8
SLVR:   derived: mpris from git
SLVR:   derived: flutter from sdk
IO  : Created temp directory /home/myuser/.pub-cache/_temp/dirCVMOOX
IO  : Spawning "git --version" in /home/myuser/projects/pub_git_dependency/.
IO  : Finished git. Exit code 0.
    | stdout:
    | | git version 2.51.0
    | | 
    | Nothing output on stderr.
FINE: Determined git command git.
IO  : Spawning "git clone --mirror https://github.com/feridinha/dart-mpris /home/myuser/.pub-cache/_temp/dirCVMOOX" in /home/myuser/projects/pub_git_dependency/.
IO  : Deleting directory /home/myuser/.pub-cache/_temp/dirCVMOOX.
SLVR: Version solving took 0:00:01.022030 seconds.
    | Tried 1 solutions.
FINE: Resolving dependencies finished (1.049s).
ERR : Missing extension byte (at offset 18)
FINE: Exception type: FormatException
ERR : dart:async                                            Future.catchError
    | package:pub/src/utils.dart 138:52                     captureErrors.wrappedCallback
    | package:stack_trace                                   Chain.capture
    | package:pub/src/utils.dart 156:11                     captureErrors
    | package:pub/src/command.dart 197:13                   PubCommand.run
    | package:args/command_runner.dart 212:27               CommandRunner.runCommand
    | package:dartdev/dartdev.dart 255:30                   DartdevRunner.runCommand
    | package:args/command_runner.dart 122:25               CommandRunner.run.<fn>
    | dart:async                                            new Future.sync
    | package:args/command_runner.dart 122:14               CommandRunner.run
    | package:dartdev/dartdev.dart 48:29                    runDartdev
    | /b/s/w/ir/x/w/sdk/pkg/dartdev/bin/dartdev.dart 13:11  main
---- Log transcript ----
FINE: Pub 3.9.0
MSG : Resolving dependencies...
SLVR: fact: pub_git_dependency is 1.0.0+1
SLVR: derived: pub_git_dependency
SLVR: fact: pub_git_dependency depends on flutter from sdk
SLVR: fact: pub_git_dependency depends on mpris from git
SLVR: fact: pub_git_dependency depends on cupertino_icons ^1.0.8
SLVR: fact: pub_git_dependency depends on flutter_test from sdk
SLVR: fact: pub_git_dependency depends on flutter_lints ^5.0.0
SLVR:   selecting pub_git_dependency
SLVR:   derived: flutter_lints ^5.0.0
SLVR:   derived: flutter_test from sdk
SLVR:   derived: cupertino_icons ^1.0.8
SLVR:   derived: mpris from git
SLVR:   derived: flutter from sdk
IO  : Created temp directory /home/myuser/.pub-cache/_temp/dirCVMOOX
IO  : Spawning "git --version" in /home/myuser/projects/pub_git_dependency/.
IO  : Finished git. Exit code 0.
    | stdout:
    | | git version 2.51.0
    | | 
    | Nothing output on stderr.
FINE: Determined git command git.
IO  : Spawning "git clone --mirror https://github.com/feridinha/dart-mpris /home/myuser/.pub-cache/_temp/dirCVMOOX" in /home/myuser/projects/pub_git_dependency/.
IO  : Deleting directory /home/myuser/.pub-cache/_temp/dirCVMOOX.
SLVR: Version solving took 0:00:01.022030 seconds.
    | Tried 1 solutions.
FINE: Resolving dependencies finished (1.049s).
ERR : Missing extension byte (at offset 18)
FINE: Exception type: FormatException
ERR : dart:async                                            Future.catchError
    | package:pub/src/utils.dart 138:52                     captureErrors.wrappedCallback
    | package:stack_trace                                   Chain.capture
    | package:pub/src/utils.dart 156:11                     captureErrors
    | package:pub/src/command.dart 197:13                   PubCommand.run
    | package:args/command_runner.dart 212:27               CommandRunner.runCommand
    | package:dartdev/dartdev.dart 255:30                   DartdevRunner.runCommand
    | package:args/command_runner.dart 122:25               CommandRunner.run.<fn>
    | dart:async                                            new Future.sync
    | package:args/command_runner.dart 122:14               CommandRunner.run
    | package:dartdev/dartdev.dart 48:29                    runDartdev
    | /b/s/w/ir/x/w/sdk/pkg/dartdev/bin/dartdev.dart 13:11  main
---- End log transcript ----
IO  : Writing 11946 characters to text file /home/myuser/.pub-cache/log/pub_log.txt.
MSG : Logs written to /home/myuser/.pub-cache/log/pub_log.txt.
[+1207 ms] pub failed
                    command: "/home/myuser/flutter/bin/cache/dart-sdk/bin/dart pub --suppress-analytics get --verbose --example --directory
                    ."
                    pub env: {
                      "FLUTTER_ROOT": "/home/myuser/flutter",
                      "PUB_ENVIRONMENT": "flutter_cli:get",
                    }
                    exit code: 65

[   +2 ms] "flutter get" took 1 257ms.
[  +13 ms] Failed to update packages.
[   +1 ms] 
           #0      throwToolExit (package:flutter_tools/src/base/common.dart:34:3)
           #1      _DefaultPub._runWithStdioInherited (package:flutter_tools/src/dart/pub.dart:478:7)
           <asynchronous suspension>
           #2      _DefaultPub.interactively (package:flutter_tools/src/dart/pub.dart:551:5)
           <asynchronous suspension>
           #3      PackagesGetCommand.runCommand (package:flutter_tools/src/commands/packages.dart:298:7)
           <asynchronous suspension>
           #4      FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:1581:27)
           <asynchronous suspension>
           #5      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:154:19)
           <asynchronous suspension>
           #6      CommandRunner.runCommand (package:args/command_runner.dart:212:13)
           <asynchronous suspension>
           #7      FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:503:9)
           <asynchronous suspension>
           #8      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:154:19)
           <asynchronous suspension>
           #9      FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:438:5)
           <asynchronous suspension>
           #10     run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:98:11)
           <asynchronous suspension>
           #11     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:154:19)
           <asynchronous suspension>
           #12     main (package:flutter_tools/executable.dart:101:3)
           <asynchronous suspension>
           
           
[        ] Running 1 shutdown hook
[   +1 ms] Shutdown hooks complete
[        ] exiting with code 65

flutter doctor -v

[✓] Flutter (Channel stable, 3.35.1, on Fedora Linux 42 (KDE Plasma Desktop Edition) 6.16.3-200.fc42.x86_64, locale fr_FR.UTF-8)
    [34ms]
    • Flutter version 3.35.1 on channel stable at /home/myuser/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 20f8274939 (il y a 4 semaines), 2025-08-14 10:53:09 -0700
    • Engine revision 1e9a811bf8
    • Dart version 3.9.0
    • DevTools version 2.48.0
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android, enable-ios,
      cli-animations, enable-lldb-debugging

[✓] Android toolchain - develop for Android devices (Android SDK version 36.0.0) [1 066ms]
    • Android SDK at /home/myuser/Android/Sdk
    • Emulator version 36.1.9.0 (build_id 13823996) (CL:N/A)
    • Platform android-36, build-tools 36.0.0
    • ANDROID_HOME = /home/myuser/Android/Sdk
    • Java binary at: /var/lib/snapd/snap/android-studio/197/jbr/bin/java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.6+-13391695-b895.109)
    • All Android licenses accepted.

[✗] Chrome - develop for the web (Cannot find Chrome executable at google-chrome) [12ms]
    ! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.

[✓] Linux toolchain - develop for Linux desktop [294ms]
    • clang version 20.1.8 (Fedora 20.1.8-4.fc42)
    • cmake version 3.31.6
    • ninja version 1.12.1
    • pkg-config version 2.3.0
    • OpenGL core renderer: AMD Radeon RX 6750 XT (radeonsi, navi22, LLVM 20.1.8, DRM 3.64, 6.16.3-200.fc42.x86_64)
    • OpenGL core version: 4.6 (Core Profile) Mesa 25.1.7
    • OpenGL core shading language version: 4.60
    • OpenGL ES renderer: AMD Radeon RX 6750 XT (radeonsi, navi22, LLVM 20.1.8, DRM 3.64, 6.16.3-200.fc42.x86_64)
    • OpenGL ES version: OpenGL ES 3.2 Mesa 25.1.7
    • OpenGL ES shading language version: OpenGL ES GLSL ES 3.20
    • GL_EXT_framebuffer_blit: yes
    • GL_EXT_texture_format_BGRA8888: yes

[✓] Android Studio (version 2025.1.1) [9ms]
    • Android Studio at /var/lib/snapd/snap/android-studio/197
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 21.0.6+-13391695-b895.109)

[✓] VS Code (version 1.103.2) [8ms]
    • VS Code at /usr/share/code
    • Flutter extension version 3.118.0

[✓] Connected device (1 available) [54ms]
    • Linux (desktop) • linux • linux-x64 • Fedora Linux 42 (KDE Plasma Desktop Edition) 6.16.3-200.fc42.x86_64

[✓] Network resources [916ms]
    • All expected network resources are available.