However maybe the make.log won't help. Because you appear to have a
working kernel driver.

I can also see this failure, which is important:

Jun 17 21:09:53 little-black-box gnome-shell[1367]: Unable to initialize 
Clutter: Unable to initialize the Clutter backend: no available drivers found.
Jun 17 21:09:53 little-black-box gnome-shell[1367]: Unable to initialize 
Clutter.

which would/should be related to:

Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) 
NVIDIA(0): Creating default Display subsection in Screen section
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]:         
"Default Screen Section" for depth/fbbpp 24/32
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (==) 
NVIDIA(0): Depth 24, (==) framebuffer bpp 32
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (==) 
NVIDIA(0): RGB weight 888
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (==) 
NVIDIA(0): Default visual is TrueColor
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (==) 
NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) 
Applying OutputClass "nvidia" options to /dev/dri/card0
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (**) 
NVIDIA(0): Option "AllowEmptyInitialConfiguration"
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (**) 
NVIDIA(0): Enabling 2D acceleration
Jun 17 21:09:53 little-black-box systemd[1]: Starting NVIDIA Persistence 
Daemon...
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) 
NVIDIA(0): NVIDIA GPU GeForce GTX 770 (GK104) at PCI:1:0:0 (GPU-0)
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (--) 
NVIDIA(0): Memory: 4194304 kBytes
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (--) 
NVIDIA(0): VideoBIOS: 80.04.c3.00.72
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) 
NVIDIA(0): Detected PCI Express Link width: 16X
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) 
NVIDIA(0): Validated MetaModes:
Jun 17 21:09:53 little-black-box nvidia-persistenced[1439]: Verbose syslog 
connection opened
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) 
NVIDIA(0):     "NULL"
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) 
NVIDIA(0): Virtual screen size determined to be 640 x 480
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (WW) 
NVIDIA(0): Unable to get display device for DPI computation.
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (==) 
NVIDIA(0): DPI set to (75, 75); computed from built-in default

Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) 
NVIDIA(0): Setting mode "NULL"
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (==) 
NVIDIA(0): Disabling shared memory pixmaps
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (==) 
NVIDIA(0): Backing store enabled
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (==) 
NVIDIA(0): Silken mouse enabled
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (==) 
NVIDIA(0): DPMS enabled
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) 
Loading sub module "dri2"
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) 
LoadModule: "dri2"
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) Module 
"dri2" already built-in
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) 
NVIDIA(0): [DRI2] Setup complete
Jun 17 21:09:53 little-black-box /usr/lib/gdm3/gdm-x-session[1434]: (II) 
NVIDIA(0): [DRI2]   VDPAU driver: nvidia

But that looks like everything is working.


** Tags added: nvidia

** Summary changed:

- GDM no longer presents GUI login Ubuntu 18.04
+ [nvidia] GDM no longer presents GUI login Ubuntu 18.04

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https://bugs.launchpad.net/bugs/1777378

Title:
  [nvidia] GDM no longer presents GUI login Ubuntu 18.04

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