It seems that we've removed an entry point that pip 22.0 uses from Python 3.12. That means that you need to install pip from get-pip.py on Ubuntu LTS python3.12.

However even with that done and tox supposedly configured to use pip 23.2.1 in its virtualenvs, I still wind up with pip 22.0 in the environments, so the environment building crashes and I can't actually run the PyOpenGL test suite automatically.

For easier googling, the errors you see:

AttributeError: module 'pkgutil' has no attribute 'ImpImporter'. Did you mean: 'zipimporter'?