Could you please check what version of gksu/libgksu you have installed
and upgrade that (e.g. via synaptic or apt-get) to the latest version?
does that resolve the issue?
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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[karmic-alpha2] Update Manager doesn't update any more
https://bugs.launchpad.net/bugs/394689
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