Public bug reported:

On 18.04
gdm3 3.28.0-0ubuntu1
4.15.0-20-generic


I suspect it is related to gdm3, but not sure.
On freshly installed final release of bionic, I somtimes cannot login to gnome 
desktop. It is always preceeded by failed login attempt even though password is 
correct.

I can switch to a virtual console, but nothing happens when trying to
switch back to graphical CTRL+ALT+F7 - stays in console.

It seems that sudo /etc/init.d/gdm3 restart might fix the problem, but I
havn't tested extensively yet.

Note also that when the problem occurs there is no XDG_SESSION choices
available on the login screen. The "settings" icon next to the login
button is gone. After this an attempt to login with correct password
will fail, and the second attempt to login with take me to the blank
screen + cursor situation described above.

I can't say how to reproduce. On my machine it happens 50% of the times.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gdm3 3.28.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 27 16:14:51 2018
InstallationDate: Installed on 2018-04-26 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=da_DK.UTF-8
 SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
--- 
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 18.04
InstallationDate: Installed on 2018-04-26 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
Package: gdm3 3.28.0-0ubuntu1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=da_DK.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Tags:  bionic
Uname: Linux 4.15.0-20-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True

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


** Tags: amd64 apport-bug apport-collected bionic

** Tags added: apport-collected

** Description changed:

  On 18.04
  gdm3 3.28.0-0ubuntu1
  4.15.0-20-generic
  
  
  I suspect it is related to gdm3, but not sure.
  On freshly installed final release of bionic, I somtimes cannot login to 
gnome desktop. It is always preceeded by failed login attempt even though 
password is correct.
  
  I can switch to a virtual console, but nothing happens when trying to
  switch back to graphical CTRL+ALT+F7 - stays in console.
  
  It seems that sudo /etc/init.d/gdm3 restart might fix the problem, but I
  havn't tested extensively yet.
  
  Note also that when the problem occurs there is no XDG_SESSION choices
  available on the login screen. The "settings" icon next to the login
  button is gone. After this an attempt to login with correct password
  will fail, and the second attempt to login with take me to the blank
  screen + cursor situation described above.
  
  I can't say how to reproduce. On my machine it happens 50% of the times.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gdm3 3.28.0-0ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Apr 27 16:14:51 2018
  InstallationDate: Installed on 2018-04-26 (0 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=da_DK.UTF-8
   SHELL=/bin/bash
  SourcePackage: gdm3
  UpgradeStatus: No upgrade log present (probably fresh install)
+ --- 
+ ApportVersion: 2.20.9-0ubuntu7
+ Architecture: amd64
+ CurrentDesktop: ubuntu:GNOME
+ DistroRelease: Ubuntu 18.04
+ InstallationDate: Installed on 2018-04-26 (0 days ago)
+ InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
+ Package: gdm3 3.28.0-0ubuntu1
+ PackageArchitecture: amd64
+ ProcEnviron:
+  TERM=xterm-256color
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=da_DK.UTF-8
+  SHELL=/bin/bash
+ ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
+ Tags:  bionic
+ Uname: Linux 4.15.0-20-generic x86_64
+ UpgradeStatus: No upgrade log present (probably fresh install)
+ UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
+ _MarkForUpload: True

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https://bugs.launchpad.net/bugs/1767388

Title:
  Sometimes cannot login to graphical environment.

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