This patch seems to fix it:
https://gitlab.gnome.org/GNOME/gdm/merge_requests/32
** No longer affects: mutter (Ubuntu)
** Changed in: gdm3 (Ubuntu)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1786883
Title:
[regression] Login screen flickers to black a few times on boot and
then finally settles on using Xorg instead of Wayland. No Wayland
login option.
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