[SOLVED] Trying to update

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http://ubuntuforums.org – I have a red warning sign on top, beside the calendar, and says: "The update information is outdated.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." And this is what I get when checking for updates : Could not download all 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 use (Hardware)