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The update information is outdated. This
may be caused by network problems or by a
repository that is no longer available.
Please update manually by selecting 'Show
updates' from the indicator menu, and
watching for any failing repositories.
Show updates
Install all updates
Check for updates
Start package manager
Show notifications
Preferences [with a wrench and screwdriver icon on left]
The answer if probably to be found in https://help.ubuntu.com/community/Repositories/Ubuntu, but that's all over my head.