We would like to help you but need some more information.
Which version of gdm are we talking about? Which release of Ubuntu?
Can you also open a terminal and run:
sudo apt-get install -f gdm
Paste the full output in this report.
When reporting back with more information please change the state of
this report back to "new". Thanks for your help.
** Package changed: ubuntu => gdm (Ubuntu)
** Changed in: gdm (Ubuntu)
Status: New => Incomplete
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gdm failed to install on upgrade
https://bugs.launchpad.net/bugs/560463
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