Update manager fails to update yet tells the update was successful

[rgyz]

Update manager fails to update a package because of bad md5 sum as I can read from the details. However above the detailed info I can read the standard message of the update manager: "Successfully applied all changes. You can close the window now." The problem could not be reproduced. I guess Update manager believes the package is now updated and does not want to update it again.
The package to be updated was the Adobe flash plugin for firefox. (it was offered by the update manager after booting today)

This bug seems to be related to Bug #144042 in ubufox!
screenshot attached

/*Ubuntu is great!*/

[James Westby (james-w)]

Hi,

This is actually a problem in flashplugin-nonfree that has already
been reported, so I am reassigning it and marking it as a duplicate.

Thanks,

James