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
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https://bugs.launchpad.net/bugs/1798790
Title:
Ubuntu 18.10 login screen never appears when using the Nvidia driver
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