Public bug reported:

With GDM installed, I cannot get to the Ubuntu login screen - it just
stays black until the monitor eventually shuts off.

The log has this helpful information about a "fail whale":

Oct 23 16:27:10 gooseberry dbus-daemon[3615]: Activating service 
name='org.gnome.ScreenSaver'
Oct 23 16:27:10 gooseberry gnome-screensav[3640]: Couldn't get presence status: 
The name org.gnome.SessionManager was not provided by any .service files
Oct 23 16:27:10 gooseberry dbus-daemon[3615]: Successfully activated service 
'org.gnome.ScreenSaver'
Oct 23 16:27:10 gooseberry gnome-session[3622]: gnome-session-binary[3622]: 
CRITICAL: We failed, but the fail whale is dead. Sorry....
Oct 23 16:27:10 gooseberry gnome-session-binary[3622]: CRITICAL: We failed, but 
the fail whale is dead. Sorry....
Oct 23 16:27:10 gooseberry gnome-screensav[3640]: gnome-screensaver: Fatal IO 
error 11 (Resource temporarily unavailable) on X server :0.
Oct 23 16:27:10 gooseberry org.a11y.atspi.Registry[3629]: XIO:  fatal IO error 
11 (Resource temporarily unavailable) on X server ":0"
Oct 23 16:27:10 gooseberry org.a11y.atspi.Registry[3629]:       after 21 
requests (21 known processed) with 0 events remaining.
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) evdev: 
Logitech USB Receiver: Close
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
UnloadModule: "evdev"
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
systemd-logind: releasing fd for 13:69
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) evdev: 
Logitech USB Receiver: Close
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
UnloadModule: "evdev"
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
systemd-logind: releasing fd for 13:68
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) evdev: 
Logitech USB Keyboard: Close
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
UnloadModule: "evdev"
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
systemd-logind: releasing fd for 13:67
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) evdev: 
Logitech USB Keyboard: Close
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
UnloadModule: "evdev"
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
systemd-logind: releasing fd for 13:66
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) evdev: Power 
Button: Close
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
UnloadModule: "evdev"
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
systemd-logind: releasing fd for 13:64
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) evdev: Power 
Button: Close
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
UnloadModule: "evdev"
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
systemd-logind: releasing fd for 13:65
Oct 23 16:27:10 gooseberry kernel: [   26.226446] nvidia-modeset: Freed GPU:0 
(GPU-d86402a0-4f53-8573-98c2-40295039d16c) @ PCI:0000:01:00.0
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) 
NVIDIA(GPU-0): Deleting GPU-0
Oct 23 16:27:10 gooseberry /usr/lib/gdm3/gdm-x-session[3587]: (II) Server 
terminated successfully (0). Closing log file.
Oct 23 16:27:10 gooseberry systemd[1]: Stopping NVIDIA Persistence Daemon...
Oct 23 16:27:10 gooseberry nvidia-persistenced: Received signal 15
Oct 23 16:27:10 gooseberry nvidia-persistenced: Socket closed.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gdm3 (not installed)
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 23 16:31:33 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-03-23 (2039 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.pam.d.gdm-password: [modified]
mtime.conffile..etc.pam.d.gdm-launch-environment: 2017-10-11T13:20:09
mtime.conffile..etc.pam.d.gdm-password: 2014-01-22T10:54:49

** Affects: gdm3 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1726425

Title:
  gdm in Ubuntu 17.10 makes my system unbootable

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