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[Jiri Grönroos <1414707@xxxxxxxxxxxxxxxxxx>]

I too have this issue with a fresh vivid installation. In my case this
isn't a virtual machine. Booting with the default options, logging into
Gnome Shell from gdm, and bam, the screen is locked instantly. Lock
screen flickers and gives authentication error.

I bypassed this problem by going into tty and restarting gdm (sudo
service gdm restart). Second login attempt doesn't lock the session
instantly. I can also confirm that by selecting the systemd boot option
the issue doesn't persist.

There's something in dmesg when booting without systemd, but with
systemd the following dmesg output doesn't exist:

dmesg |grep logind

[    6.988059] systemd-logind[1754]: Watching system buttons on /dev/input/event1 (Power Button)
[    6.988085] systemd-logind[1754]: Watching system buttons on /dev/input/event0 (Power Button)
[    6.988095] systemd-logind[1754]: New seat seat0.
[    6.990545] systemd-logind[1754]: Failed to start user service: Unknown unit: user@120.service
[    6.992441] systemd-logind[1754]: New session c1 of user gdm.
[   21.103729] systemd-logind[1754]: Failed to start user service: Unknown unit: user@1000.service
[   21.105989] systemd-logind[1754]: New session c2 of user myusername.
[   56.858239] systemd-logind[1754]: Removed session c1.
[   63.669131] systemd-logind[1754]: New session c3 of user gdm.
[   70.428732] systemd-logind[1754]: New session c4 of user myusername.

[   56.858239] systemd-logind[1754]: Removed session c1. <- this is the
output when restarting gdm from tty.

Hopefully this helps a little bit.

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https://bugs.launchpad.net/bugs/1414707

Title:
  Login fails, returns to login and flickering prevents password typing

Status in gdm package in Ubuntu:
  Incomplete

Bug description:
  I was testing Ubuntu Gnome 15.04 in VirtualBox. I was able to login
  into the machine a few times and run updates and install a few
  programs. I also installed the VirtualBox guest additions. Since today
  this happens:

  I log into the machine. The login is accepted and the machine does
  something for a few seconds. Then the machine jumps back to login, but
  with a random flickering. The flickering also resets the password
  field, which prevents it from being typed.

  So I can't login into the machine anymore.

  I am using a HP Probook 6570 b which I upgraded to 16 GB of RAM. The
  iso was from the 20th of January, but I did a daily sudo apt-get
  upgrade on it.

  Video: https://www.youtube.com/watch?v=7Xpt39AKVuE&feature=youtu.be
  --- 
  ApportVersion: 2.15.1-0ubuntu2
  Architecture: amd64
  DistroRelease: Ubuntu 15.04
  InstallationDate: Installed on 2015-01-22 (5 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Alpha amd64 (20141218)
  Package: gdm 3.14.1-0ubuntu1
  PackageArchitecture: amd64
  ProcEnviron:
   LANGUAGE=de_AT:de
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_AT.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.18.0-9.10-generic 3.18.2
  Tags:  vivid
  Uname: Linux 3.18.0-9-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True

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