Login screen flickers to black a few times on boot and then finally settles on Xorg. No Wayland login option.
The Ubuntu 18.10 login screen flickers to black a few times on boot and then finally settles on using Xorg instead of Wayland.
gdm3 version 3.29.91-1ubuntu1
mutter version 3.29.90-1
It seems to be reproducible: journal.txt journal2.txt journal3.txt journal4.txt
Downstream: https://launchpad.net/bugs/1786883