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[Evan R <emanguy1@xxxxxxxxx>]

When I was fishing around in /etc/gdm/custom.conf I noticed this line:

[daemon]
# Uncomment the line below to force the login screen to use Xorg
#WaylandEnable = false

After doing a bit of research I found this:
https://wiki.archlinux.org/index.php/GDM#Use_Xorg_backend which says
that by default, GDM 3.16+ uses Wayland as the default display server. I
installed the xwayland package and GDM started working again. Apparently
xwayland isn't one of GDM's  dependencies, given my "apt-cache rdepends
gdm" output.

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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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