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[Tony Mansson <tony.mansson@xxxxxxxxxx>]

For me the gvm blackscreen could be fixed by installing ubuntu-gnome-
desktop and then running "sudo dpkg-reconfigure lightdm". However, this
created an endless login loop for all users. The way to fix the endless
loop problem was to select the Mate desktop environment before logging
in. Then everything worked. Choosing Compiz or Metacity Window Manager
keeps you looping.

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https://bugs.launchpad.net/bugs/1500673

Title:
  gdm unusable after upgrading to 15.10

Status in gdm package in Ubuntu:
  Confirmed

Bug description:
  Hi there -- I figured I'd try 15.10 a few days before release, and
  when gdm is the default greeter, I see no login prompt and I have to
  CTRL-ALT-F1 to get to a terminal. As far as I can tell, there's
  nothing interesting in the logs in /var/log or /var/log/gdm. I just
  get a blank, black screen.

  As a side note, I'm seeing the error messages described in
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1492764, but I
  don't think they are the root cause for a missing X-server (AFAICT,
  there's no X server starting).

  Please advice on how I can troubleshoot further. `dkg-reconfigure gdm`
  and choosing lightdm yields a GUI login prompt in lightdm.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: gdm 3.16.2-0ubuntu2
  ProcVersionSignature: Ubuntu 4.2.0-11.13-generic 4.2.1
  Uname: Linux 4.2.0-11-generic x86_64
  ApportVersion: 2.19-0ubuntu1
  Architecture: amd64
  Date: Mon Sep 28 20:15:50 2015
  InstallationDate: Installed on 2014-07-02 (453 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  SourcePackage: gdm
  UpgradeStatus: Upgraded to wily on 2015-09-29 (0 days ago)

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