Thanks for your bugreport.
Can you please try to run:
$ sudo apt-get install --reinstall app-install-data gnome-app-install
and tell me if that helps? What upgrade method did you used?
Thanks,
Michael
** Changed in: gnome-app-install (Ubuntu)
Status: Unconfirmed => Needs Info
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[Feisty] ummmm... just upgraded from Edgy and Add/Remove is empty!
https://bugs.launchpad.net/bugs/108371
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