There are not any gdm crash reports in /var/crash. Neither do I find
anything gdm related at https://errors.ubuntu.com/.

In my journalctl log, I do find this: 
feb 07 02:29:00 Dapple systemd[53605]: Stopped GNOME Shell on X11.
feb 07 02:29:00 Dapple systemd[53605]: Starting GNOME Shell on X11...
feb 07 02:29:00 Dapple systemd[53605]: [email protected]: Skipped due 
to 'exec-condition'.
feb 07 02:29:00 Dapple systemd[53605]: Condition check resulted in GNOME Shell 
on X11 being skipped.

That sequence is repeated three times and then X11 appears to be replaced with 
wayland:
feb 07 02:29:00 Dapple gnome-shell[53866]: Running GNOME Shell (using mutter 
42.5) as a Wayland display server
[...]
feb 07 02:29:01 Dapple gnome-shell[53866]: Enabling experimental feature 
'x11-randr-fractional-scaling'
feb 07 02:29:01 Dapple gnome-shell[53866]: Enabling experimental feature 
'scale-monitor-framebuffer'
feb 07 02:29:01 Dapple gnome-shell[53866]: Created gbm renderer for 
'/dev/dri/card0'
feb 07 02:29:01 Dapple dbus-daemon[53634]: [session uid=1001 pid=53634] 
Successfully activated service 'org.gtk.vfs.Metadata'
feb 07 02:29:01 Dapple systemd[53605]: Started Virtual filesystem metadata 
service.
feb 07 02:29:01 Dapple gnome-shell[53866]: Disabling DMA buffer screen sharing 
(implicit modifiers not supported)
feb 07 02:29:01 Dapple gnome-shell[53866]: Using public X11 display :2, (using 
:3 for managed services)
feb 07 02:29:01 Dapple gnome-shell[53866]: Using Wayland display name 
'wayland-0'
[...]
feb 07 02:29:12 Dapple systemd[53605]: Started GNOME Shell on Wayland.
feb 07 02:29:12 Dapple systemd[53605]: Reached target GNOME Session is 
initialized.
feb 07 02:29:12 Dapple systemd[53605]: GNOME session X11 services is inactive.

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https://bugs.launchpad.net/bugs/2006059

Title:
  gdm requires a second login to start  xorg session instead of wayland

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