[ubuntu] Updating issues

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http://ubuntuforums.org – I have a problem. In the bar at the top of my screen, there is a little red triangle with an exclamation point in the middle. When I click it, it says: "The update information is outdated.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 selecting 'show updates' from the indicator menu, and watching for any failing repositories." I go to update manually, as it says to do. At first there WAS an update that kept failing but eventually did download and install after a few tries. The update was for Firefox. The triangle we (Hardware)