Please describe the problem:
With gconf2 2.26.0, i am unable to start gnome-terminal, other applications work fine.

Steps to reproduce:
1. open terminal
2. type gksu -d -S gnome-terminal


Actual results:
andreas@andreas-desktop:~$ gksu -d -S gnome-terminal
No ask_pass set, using default!
xauth: /tmp/libgksu-3SHlAA/.Xauthority
STARTUP_ID: gksu/gnome-terminal/17703-0-andreas-desktop_TIME19032252
cmd[0]: /usr/bin/sudo
cmd[1]: -H
cmd[2]: -S
cmd[3]: -p
cmd[4]: GNOME_SUDO_PASS
cmd[5]: -u
cmd[6]: root
cmd[7]: --
cmd[8]: gnome-terminal
buffer: -Failed to contact the GConf daemon; exiting.-
brute force GNOME_SUDO_PASS ended...
No password prompt found; we'll assume we don't need a password.
Failed to contact the GConf daemon; exiting.xauth: /tmp/libgksu-3SHlAA/.Xauthority
xauth_env: /home/andreas/.Xauthority
dir: /tmp/libgksu-3SHlAA


Expected results:
A root-terminal would open.

Does this happen every time?
Yes

Other information:
Possibly related/a dupe of bug #555745

Reported on Launchpad:
https://bugs.launchpad.net/bugs/328575