Thanks for your bugreport.
This sounds like a duplicate of bug #237325. Please install libgksu2-0 from
hardy-updates. You can do this via a terminal by typing:
$ sudo apt-get update ; sudo apt-get install libgksu2-0
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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update manger freezes after upgrade to Hardy Heron
https://bugs.launchpad.net/bugs/237798
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