More specifically, the critical file from ubuntu-gnome-default-settings is:
/usr/share/glib-2.0/schemas/20_ubuntu-gnome-default-settings.gschema.override 

If you remove that file and update schemas (one way is "dpkg-reconfigure 
libglib2.0-0"), gdm won't start properly.
If you re-add the file and update schemas, gdm starts working.

Also noteworthy: the gdm log file is now (null)-greeter.log instead of
:0-greeter.log.

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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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