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[Thomas Beckett <thomas.beckett@xxxxxxxxx>]

Also when booting without systemd active and the GDM is refreshing
(flickering), GDM gives an error of "Authentication errror" so the
problem may be with polkit?

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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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