Thanks for the update. Great you got things working on your end as well. Have you tried a second monitor by any chance to see if that is working for you? Jim
Today I got Xorg loading. Yay! Me too - I think we must have been working on it about the same time. Yes, I've found many of the same shortcomings you did in the current setup, but I'm confident that Ubuntu will get the upstream patch applied soon.
Like you, I did:
sudo apt-get purge nvidia*
but I also saw this in .xsession-errors
dbus-update-activation-environment: warning: error sending to systemd: org.freedesktop.DBus.Error.InvalidArgs: Invalid environment assignments
which led me to this Ubuntu bug: https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/1731614
which made me try:
sudo apt-remove --purge gdm3 sudo apt install lightdm ubuntu-session
Rebooting got me to the lightdm prompt, which worked for login. I think I'm running in unaccelerated fallback mode, but I have working graphics now.
Thanks for the help!
Stewart