Phillip,
Mutter is not just a binary, but is also the library which provides ALL
the graphics for the login screen and gnome-shell. So yes Ubuntu does
use mutter for everything :)
If your Wayland login option has gone missing then that means the
Wayland backend ("eglnative") of mutter had crashed during startup and
so has been disabled. Please log a NEW bug for that by running:
ubuntu-bug gnome-shell
on the machine.
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https://bugs.launchpad.net/bugs/1652282
Title:
Xwayland not using XAUTHORITY, prevents root applications from
connecting
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