Public bug reported:

Immediately after I login on Ubuntu 18.10 into gnome-shell, gdm
disappears even though gnome-shell is fine: if I try switching to tty1
with CTRL-ALT F1, I just see a list of bootup messages (like 'Starting
Fingerpint Authentication Daemon').

loginctl shows only one session:

$ loginctl
SESSION  UID USER  SEAT  TTY 
      2 1001 rocko seat0 tty2

1 sessions listed.

There's no crash file in /var/crash, and no useful information in gdm3's
status:

$ systemctl status gdm3
● gdm.service - GNOME Display Manager
   Loaded: loaded (/lib/systemd/system/gdm.service; static; vendor preset: 
enabled)
  Drop-In: /lib/systemd/system/display-manager.service.d
           └─xdiagnose.conf
   Active: active (running) since Thu 2018-09-27 09:33:45 AWST; 4min 46s ago
  Process: 1356 ExecStartPre=/usr/share/gdm/generate-config (code=exited, 
status=0/SUCCESS)
 Main PID: 1364 (gdm3)
    Tasks: 3 (limit: 4915)
   Memory: 9.0M
   CGroup: /system.slice/gdm.service
           └─1364 /usr/sbin/gdm3

Warning: Journal has been rotated since unit was started. Log output is
incomplete or unavailable.


If I try switching to another user via the gnome-shell menu, gdm3 gets 
restarted and I get the login screen again on tty1. However, if gnome-shell 
crashes (eg when it freezes), I can't easily restart gdm3, so it's a nuisance.

Previously, the gdm3 login screen was always available on tty1 so it was
easy to switch to backup user if the first user's session crashed.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: gdm3 3.30.0-0ubuntu2
Uname: Linux 4.19.0-041900rc5-generic x86_64
ApportVersion: 2.20.10-0ubuntu11
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Sep 27 09:34:22 2018
InstallationDate: Installed on 2017-08-16 (406 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
SourcePackage: gdm3
UpgradeStatus: Upgraded to cosmic on 2018-08-15 (42 days ago)

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


** Tags: amd64 apport-bug cosmic

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https://bugs.launchpad.net/bugs/1794638

Title:
  gdm crashes immediately after login

Status in gdm3 package in Ubuntu:
  New

Bug description:
  Immediately after I login on Ubuntu 18.10 into gnome-shell, gdm
  disappears even though gnome-shell is fine: if I try switching to tty1
  with CTRL-ALT F1, I just see a list of bootup messages (like 'Starting
  Fingerpint Authentication Daemon').

  loginctl shows only one session:

  $ loginctl
  SESSION  UID USER  SEAT  TTY 
        2 1001 rocko seat0 tty2

  1 sessions listed.

  There's no crash file in /var/crash, and no useful information in
  gdm3's status:

  $ systemctl status gdm3
  ● gdm.service - GNOME Display Manager
     Loaded: loaded (/lib/systemd/system/gdm.service; static; vendor preset: 
enabled)
    Drop-In: /lib/systemd/system/display-manager.service.d
             └─xdiagnose.conf
     Active: active (running) since Thu 2018-09-27 09:33:45 AWST; 4min 46s ago
    Process: 1356 ExecStartPre=/usr/share/gdm/generate-config (code=exited, 
status=0/SUCCESS)
   Main PID: 1364 (gdm3)
      Tasks: 3 (limit: 4915)
     Memory: 9.0M
     CGroup: /system.slice/gdm.service
             └─1364 /usr/sbin/gdm3

  Warning: Journal has been rotated since unit was started. Log output
  is incomplete or unavailable.

  
  If I try switching to another user via the gnome-shell menu, gdm3 gets 
restarted and I get the login screen again on tty1. However, if gnome-shell 
crashes (eg when it freezes), I can't easily restart gdm3, so it's a nuisance.

  Previously, the gdm3 login screen was always available on tty1 so it
  was easy to switch to backup user if the first user's session crashed.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: gdm3 3.30.0-0ubuntu2
  Uname: Linux 4.19.0-041900rc5-generic x86_64
  ApportVersion: 2.20.10-0ubuntu11
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Sep 27 09:34:22 2018
  InstallationDate: Installed on 2017-08-16 (406 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  SourcePackage: gdm3
  UpgradeStatus: Upgraded to cosmic on 2018-08-15 (42 days ago)

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