[ubuntu] Fix update manager so it doen't ask twice

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http://ubuntuforums.org – My problem with Update Manager is that it never seems to stop asking me to install updates I don't want. I would like a setting whereby when I decline an update, it doesn't show up again. Is this possible? For instance, every time it pops up, it has the same updates for Thunderbird, which I don't use - how can I make them go away? (Hardware)