[Bug 76693] gdmsetup fails to start

[Trouilliez vincent]

Public bug reported:

Binary package hint: gdm

Running up to date Feisty.

A few days ago gdm got updated, IIRC that included a reworked gdmsetup GUI. 
I wanted to check it out, but gdmsetup failed to start.
It doesn't pop up any error window, and when started from the command line, it doesn't print any message or warning whatsoever, absolutely nothing at all, just a blinking cursor. It hangs there for a minute or so, then returns.

How can I debug it ? Is there a -debug version of gdmsetup ?
Instructions to get backtrace or run it trough a debugger ? I am ready
to help ;-)

** Affects: gdm (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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gdmsetup fails to start
https://launchpad.net/bugs/76693