Well, there's an icon at the top where they usually show up that is orange and when I mouse over it I read the following: The update information is outdated.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 clicking on this icon and then selecting 'Check for updates' and check if some of the listed repositories fail.
So I click on it and it says my system is up-to-date. It says the package information was last updated 14 days ago.
If I click on check for updates it does and then I get this pop-up windows with the message: Could not download all the repository indexes. The repository may no longer be available or could not be contacted because of network problems. If available an older version of the failed index will be used. Otherwise the repository will be ignored. Check your network connection and ensure the repository address in the preferences is correct.
Under that it says: Failed to fetch http://apt.boxee.tv/dists/interpid/main/binary-i386/Packages.gz
404 Not Found
Some index files failed to download, they have been ignored, or old ones used instead.