Packagekit is not installed, so that's not the problem causer.
>From a terminal can you run :

$ sudo apt-get update

If that return no errors:

$ sudo apt-get upgrade

Then you system should be upgraded to the latest versions, after which the 
error should be eliminated.
Please post any errors that are occuring.
Thank you.

-- 
update manager reported corrupted update package
https://bugs.launchpad.net/bugs/307860
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