Thanks for your bugreport.
It looks like your apt keys are incorrect. Please open the software-
propoerties application (System/Administration/Software Sources) and go
to the authentication tab. Then click "Restore defaults". After that,
please run "reload" in update-manager. If that dosn't help, please
reopen the bug.
This should fix the problem.
Thanks,
Michael
** Changed in: update-manager (Ubuntu)
Status: Unconfirmed => Fix Released
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Update Manager (manual startup)
https://launchpad.net/bugs/93423
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