Thanks for your bugreport.
This sounds like its a gksu problem, please check bug #237325 and see if
the updated version of libgksu2-0 from my PPA fixes the issue (more
details in the bug I mentioned).
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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can not install new packages.
https://bugs.launchpad.net/bugs/235356
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