### Summary All's in the title. See e.g. https://github.com/matplotlib/matplotlib/runs/5056485756?check_suite_focus=true#step:12:184 ("SKIPPED [2] lib/matplotlib/tests/test_backends_interactive.py:159: Skipping {'MPLBACKEND': 'gtk4agg'} because no usable GTK bindings"), also check codecov at https://app.codecov.io/gh/matplotlib/matplotlib/blob/447160e0c78a3f834696fbf6b4dca967d9bd05a4/lib/matplotlib/backends/backend_gtk4.py. ### Proposed fix Install whatever dependencies are needed to run gtk4 on CI.
Activity
QuLogic commentedon Feb 4, 2022
Yes, this is because GTK4 is not available until Ubuntu 21.04, and we only have 18.04 and 20.04
anntzer commentedon Feb 4, 2022
OK, I guess you can close this as non-actionable for now or keep it as a reminder to add it once newer images are available.
QuLogic commentedon Jun 25, 2024
These were added on Ubuntu in #26090 and macOS in #26605.