[Bug 32595] gdmsetup user list is broken

[Gav]

Public bug reported:
https://launchpad.net/malone/bugs/32595

Affects: gdm (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
I've just dist-upgraded from breezy to dapper, and when I ran gdmsetup
to restore my custom GDM theme, I went onto the users tab. The left hand
list (Include:) contains only one entry, which is "Sans". The right hand
list (Exclude:) contains only one entry, which is a square with "0004"
inside it.

I believe that these lists should contain various system and non-system
users.