Thanks. I think I can see the problem now. The first thing that happens is that gdm3 tries to start a Wayland login screen ('gnome-shell' process) and fails because the Nvidia driver doesn't support KMS:
Oct 23 11:59:14 efthimios-GA-78LMT-USB3 gnome-shell[1688]: meta_kms_resources_init failed: Calling drmModeGetResources() failed, assuming we have no outputs Oct 23 11:59:14 efthimios-GA-78LMT-USB3 gnome-shell[1688]: Failed to create backend: No GPUs with outputs found That is not a bug. What it should do next (and does on my machine) is then try again to start the login screen using X instead. However I can't see that in your log. You might have something odd installed or preventing the fallback from working. Please: 1. Report the bug to the gdm developers here: https://gitlab.gnome.org/GNOME/gdm/issues and then tell us the new bug ID. 2. Try this as a workaround: edit /etc/gdm3/custom.conf and uncomment the line: #WaylandEnable=false -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1798790 Title: Ubuntu 18.10 login screen never appears when using the Nvidia driver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1798790/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs