Failed to parse /home/user/project_name/.dart_tool/package_graph.json: dependencies for `example` missing. Try running `flutter pub get`

[nespjin]

Environment

Flutter 3.35.1
Ubuntu 25.04

Problem

In the member packages of workspace, there is an example sub-package. example does not have pub get, and when running pub get in workspace, this problem will occur

The directory such as:
workspace/

• packages/
• package_a/

•    example
  

• pubspec.yaml

The pubspec.yaml of workspace

workspace:
  - packages/package_a

[evaisse]

I got a similar issue, and it works fine on macos, but fails on the CI with container ghcr.io/cirruslabs/flutter

I got a struct like this :

/
/pubspec.yaml  # workspace definition 
    /packages/
        feature_bar/..
        feature_foo/..
            pubspec.yaml # contains `resolution: workspace`
            example/
                pubspec.yaml # does NOT contains `resolution: workspace`, named feature_foo_example

And I got this error :

Dependency resolution failed, rolling back changes to the pubspec.yaml files...
  - workspace
    └> .

       └> Failed to run pub get.
Failed to parse /build/.dart_tool/package_graph.json: dependencies for `feature_foo_example` missing.
Try running `flutter pub get`

My flutter env

[!] Flutter (Channel [user-branch], 3.35.2, on macOS 15.6.1 24G90 darwin-arm64, locale fr-FR) [672ms]
    ! Flutter version 3.35.2 on channel [user-branch] at /Users/evaisse/Library/Flutter
      Currently on an unknown channel. Run `flutter channel` to switch to an official channel.
      If that doesn't fix the issue, reinstall Flutter by following instructions at https://flutter.dev/setup.
    ! Upstream repository unknown source is not the same as FLUTTER_GIT_URL
    • FLUTTER_GIT_URL = https://github.com/flutter/flutter.git
    • Framework revision 05db968908 (4 weeks ago), 2025-08-25 10:21:35 -0700
    • Engine revision a8bfdfc394
    • Dart version 3.9.0
    • DevTools version 2.48.0
    • Pub download mirror https://pub.dev/artifactory/api/pub/web-v-pub
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android, enable-ios, cli-animations, enable-native-assets, enable-lldb-debugging
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[!] Android toolchain - develop for Android devices (Android SDK version 35.0.0) [1 948ms]
    • Android SDK at /Users/evaisse/Library/Android/sdk
    • Emulator version 35.3.11.0 (build_id 12836668) (CL:N/A)
    • Platform android-36, build-tools 35.0.0
    • Java binary at: /opt/homebrew/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home/bin/java
      This JDK is specified in your Flutter configuration.
      To change the current JDK, run: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment Homebrew (build 17.0.16+0)
    ! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses

The flutter doctor of the container

[!] Flutter (Channel [user-branch], 3.35.2, on Ubuntu 24.04.1 LTS 5.15.0-153-generic, locale en_US.UTF-8) [32ms]
    ! Flutter version 3.35.2 on channel [user-branch] at /sdks/flutter
      Currently on an unknown channel. Run `flutter channel` to switch to an official channel.
      If that doesn't fix the issue, reinstall Flutter by following instructions at https://flutter.dev/setup.
    ! Upstream repository unknown source is not a standard remote.
      Set environment variable "FLUTTER_GIT_URL" to unknown source to dismiss this error.
    • Framework revision 05db968908 (4 weeks ago), 2025-08-25 10:21:35 -0700
    • Engine revision a8bfdfc394
    • Dart version 3.9.0
    • DevTools version 2.48.0
    • Pub download mirror https://pub.dev/artifactory/api/pub/web-v-pub
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android, enable-ios, cli-animations, enable-native-assets, enable-lldb-debugging
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0) [2.4s]
    • Android SDK at /opt/android-sdk-linux
    • Emulator version unknown
    • Platform android-35, build-tools 35.0.0
    • ANDROID_HOME = /opt/android-sdk-linux
    • ANDROID_SDK_ROOT = /opt/android-sdk-linux
    • Java binary at: /usr/bin/java
      This JDK was found in the system PATH.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.6+7-Ubuntu-124.04.1)

[sigurdm]

This looks like a bug.
I'm still not entirely sure what is going on.

Can you reduce this to an example I could look at?

[sigurdm]

(By the way this is failing inside flutter_tool here: https://github.com/flutter/flutter/blob/1709c884aaeb70f2bcbed2887d2738f30f337b93/packages/flutter_tools/lib/src/package_graph.dart#L42)

[sigurdm]

Also: what command are you running?