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[Bug 1500673] [NEW] gdm unusable after upgrading to 15.10

 

Public bug reported:

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)

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


** Tags: amd64 apport-bug wily

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

Title:
  gdm unusable after upgrading to 15.10

Status in gdm package in Ubuntu:
  New

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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