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[Bug]: Unit tests: Ubuntu 22.04 lacks dependencies required for recent PyGObject versions #29749
Description
Bug summary
The recently-released Python PyGObject package v3.52.0 requires a major upgrade of the system glib dependencies. For example, it expects to find girepository-2.0 where previously girepository-1.0 would satisfy dependencies.
This can be observed in recent mainline build logs: https://github.com/matplotlib/matplotlib/actions/runs/13819552073/job/38661296332#step:10:306
This is a similar issue to #29732, but affecting Ubuntu 22.04.
Code for reproduction
N/AActual outcome
GTK-related tests should run during the GitHub Actions Linux CI test jobs (tests.yml workflow).
Expected outcome
GTK-related tests are skipped due to the inability of the library to load the relevant glib functionality.
Additional information
The libgirepository-2.0-0 system package that I believe may be necessary to unblock the PyGObject>3.52.0 upgrade on Linux platforms is available on Ubuntu 24.04 (aka ubuntu-24.04 or ubuntu-latest at the time-of-writing in GitHub Actions' current runner images).
However, v2.0 of the same package is not currently available -- and I would guess is unlikely to become available -- on Ubuntu 22.04.
Operating system
Ubuntu 22.04
Matplotlib Version
Matplotlib Backend
N/A
Python version
No response
Jupyter version
N/A
Installation
None
Activity
jayaddison commentedon Mar 14, 2025
I've spent a day or two thinking about this, but have not yet investigated the technical reasons for the incompatibility.
My sense is that
PyGObjectmay have moved to upgrade more quickly than anticipated. I say that based on the fact that recent versions ofglib-2.0itself does not yet seem to requiregirepository-2.0.As a result: I plan to file an issue on the GNOME
gobject.git(PyGObject) repository to ask whether these failures are expected and/or whether backwards compatibility could be maintained.Even so: I think it may be worth adding Ubuntu 24.04 to the
matplotlibGitHub Actions CI. I didn't find a defined policy for the versioning of CI images/runners in use at the moment. Hopefully adding Ubuntu 24.04 to the mix (perhaps only for one or two of the jobs, initially) would not be too difficult. I could probably find some time to volunteer on that next week, unless someoe else is already likely to look at it.jayaddison commentedon Mar 17, 2025
From additional reading: there was previous discussion upstream before increasing the dependency version; in particular:
...so, given that it was already discussed and agreed there, I do not plan to add a bugreport there (nitpick:
pygobject.git, notgobject.git).Instead I think it would be possible to upgrade the Ubuntu base image and
girepositorydependency for some CI jobs here.