Comment 13 for bug 1001904

If you are having this issue: (running ubuntu 12.04)

-click settings (bottom left) in your update manager window
-goto the "other software tab"
-you will have find the specific entry in the following list that contains "hardy"
in the 'distribution field'. find this by highlighting a list entry, and then click edit.
-once you have found the suspect entry, uncheck it in the 'other software' list.
-close the window and check for updates.

I think this is what adam was trying to say.. tho in a much more respectable "here let me help you" sort of way.
thanks for the help adam.