[Bug 1324805] [NEW] Unable to launch Gnome from KDM in 14.04

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Summary:

I have installed Ubuntu 14.04 on a number of machines and set them to
use kdm as the display manager. This works fine except for when a user
attempts to log in to a Gnome session. The greeter just disappears and
nothing happens.

The user is authenticated according to auth.log:

    May 30 09:35:42 machine kdm: :0[2302]: pam_krb5(kdm:auth): user user authenticated as user at DOMAIN
    May 30 09:35:42 machine kdm: :0[2302]: pam_unix(kdm:account): unrecognized option [ignore_root]
    May 30 09:35:42 machine kdm: :0[2302]: pam_unix(kdm:session): session opened for user user by (uid=0)

But there's not a lot of Gnome processes running.

    root at machine:~# ps -fu user
    UID        PID  PPID  C STIME TTY          TIME CMD
    user      2346  2302  0 09:35 ?        00:00:00 init --user
    user      2419  2346  0 09:35 ?        00:00:00 ssh-agent -s
    user      2424  2346  0 09:35 ?        00:00:00 dbus-daemon --fork --session --address=unix:abstract=/tmp/dbus-B6YOSxHnPA
    user      2430  2346  0 09:35 ?        00:00:00 upstart-event-bridge
    user      2432  2346  0 09:35 ?        00:00:00 upstart-file-bridge --daemon --user
    user      2434  2346  0 09:35 ?        00:00:00 upstart-dbus-bridge --daemon --session --user --bus-name session
    user      2436  2346  0 09:35 ?        00:00:00 upstart-dbus-bridge --daemon --system --user --bus-name system

The Gnome session works fine when using lightdm.

1. lsb_release -rd:

Description:    Ubuntu 14.04 LTS
Release:        14.04

2. apt-cache policy kdm:

kdm:
  Installed: 4:4.11.9-0ubuntu0.2
  Candidate: 4:4.11.9-0ubuntu0.2
  Version table:
 *** 4:4.11.9-0ubuntu0.2 0
        500 file:/import/ftp/ubuntu/ trusty-updates/universe amd64 Packages
        100 /var/lib/dpkg/status
     4:4.11.8-0ubuntu6 0
        500 file:/import/ftp/ubuntu/ trusty/universe amd64 Packages

3. Expected result:

User should log in to a Gnome session.

4. What actually happened:

User is stuck at a blank screen. Only the kdm background image is
visible.

** Affects: kde-workspace (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: gnome3 kdm trusty
-- 
Unable to launch Gnome from KDM in 14.04
https://bugs.launchpad.net/bugs/1324805
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