Cannot install kohya_ss via StabilityMatrix: No module named 'pkg_resources'

[vldevel]

Package

kohya_ss

When did the issue occur?

Installing the Package

What GPU / hardware type are you using?

RTX 5070Ti , CUDA 12.8 (NVIDIA driver v475.64.05), but this is irrelevant to this installation issue

What happened?

I'm trying to install kohya_ss via StabilityMatrix under Linux.
Whatever the Python version I choose (*), I'm getting an error reporting: No module named 'pkg_resources'

(*) I tried v3.10.11 which is what StabilityMatrix is using itself, v3.10.19 and v3.11.14; v3.12 and newer do not seem supported by kohya_ss anyway, see bmaltais/kohya_ss@b48c86c

Console output

Unpacking resources
Unpacking resources
Download Complete
Using Python 3.10.19 environment at: venv
Resolved 7 packages in 131ms
Downloading uv (23.8MiB)
Downloading pygments (1.2MiB)
Downloaded pygments
Downloaded uv
Prepared 7 packages in 338ms
Installed 7 packages in 5ms

• markdown-it-py==4.0.0
• mdurl==0.1.2
• packaging==26.1
• pygments==2.20.0
• rich==15.0.0
• setuptools==82.0.1
• uv==0.11.7
  Traceback (most recent call last):
  File "/opt/StabilityMatrix/Data/Packages/kohya_ss/setup/setup_linux.py", line 3, in
  import setup_common
  File "/opt/StabilityMatrix/Data/Packages/kohya_ss/setup/setup_common.py", line 8, in
  import pkg_resources
  ModuleNotFoundError: No module named 'pkg_resources'
  Could not install kohya_ss (StabilityMatrix.Core.Exceptions.ProcessException: install script failed with code 1: 'Traceback (most recent call last):\n File "/opt/StabilityMatrix/Data/Packages/kohya_ss/setup/setup_linux.py", line 3, in \n import setup_common\n File "/opt/StabilityMatrix/Data/Packages/kohya_ss/setup/setup_common.py", line 8, in \n import pkg_resources\nModuleNotFoundError: No module named 'pkg_resources'\n'
  at StabilityMatrix.Core.Python.UvVenvRunner.CustomInstall(ProcessArgs args, Action1 outputDataReceived) at StabilityMatrix.Core.Models.Packages.KohyaSs.InstallPackage(String installLocation, InstalledPackage installedPackage, InstallPackageOptions options, IProgress1 progress, Action1 onConsoleOutput, CancellationToken cancellationToken) at StabilityMatrix.Core.Models.Packages.KohyaSs.InstallPackage(String installLocation, InstalledPackage installedPackage, InstallPackageOptions options, IProgress1 progress, Action1 onConsoleOutput, CancellationToken cancellationToken) at StabilityMatrix.Core.Models.PackageModification.InstallPackageStep.ExecuteAsync(IProgress1 progress, CancellationToken cancellationToken)
  at StabilityMatrix.Core.Models.PackageModification.PackageModificationRunner.ExecuteSteps(IEnumerable`1 steps))

Version

v2.15.7

What Operating System are you using?

Linux