If you don't find evidence of crashes then after running 'systemctl start gdm' please run:
journalctl -b0 > journal.txt and attach the resulting text file here. ** Changed in: gdm3 (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm3 in Ubuntu. https://bugs.launchpad.net/bugs/1994993 Title: GDM won't start after update, systemctl start gdm just hangs indefinitely, using nvidia-drivers-520 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1994993/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs