Wayland sessions have disappeared from my gdm3 login screen. I typically use Wayland, but had switched temporarily to Xorg for a few days for a specific purpose. Now the Wayland options are gone.
Some possibly relevant observations:
- I know Wayland works still on my system: I can get a working Wayland session using LightDM or by starting a gnome session from a virtual console with XDG_SESSION_TYPE set to wayland
- WaylandEnable=false is commented out in /etc/gdm3/custom.conf (as it always was)
- I do have an Nvidia GPU, but it's disabled with prime-select intel (ie. the config is exactly as it has been for running Wayland).
- the relevant *.desktop files are still present in /usr/share/wayland-sessions/
- I haven't installed anything significant since the Wayland sessions were present a few days ago - just a couple of end-user apps.
- I have tried un- and re-installing the gdm3 package, and doing a `dpkg-reconfigure gdm3`, both to no effect
What might cause the session options to disappear and how can I reinstate them?