Thanks for your bugreport.
This sounds like a issue with gksu. Could you please open a terminal and run:
$ gksu id
and tell me what output that gives you?
Could you also please run "locale" and let me know what that outputs?
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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Update Manager never actually updates
https://bugs.launchpad.net/bugs/237025
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