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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