The Debian GNOME team is in the process of removing gjs, and therefore
gnome-shell and gdm3, from armel, because the upgrade to mozjs128 has
made it impractical to support architectures whose baseline does not
include atomic operations.
openmsx-catapult has an autopkgtest that installs gdm3. Please exclude
armel from the list of architectures where this test is expected to be
runnable, for example by applying the attached patch.
I'm reasonably sure that gdm3 is not actually required for this test:
the test runs xvfb-run, which does not require a display manager. However,
I don't know the specifics of this package or whether it has non-obvious
dependencies on some GNOME component.
If you can reduce the test's dependencies to avoid a dependency on
gdm3 and gnome-shell so that it is still runnable on armel, that would
be an equally valid solution.
Thanks,
smcv