[ubuntu] Could not download all repository indexes>> Can Anyone help me?

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http://ubuntuforums.org – hi, I'm a newbie ubuntu user and I'm starting to like it's environment and stuff. And then a problem emerges, when I open the update manger there's an option there that if I want to upgrade my system to 10.10 (mine is 10.04) when I clicked it some loading and updating happens and then an ERROR.. Could not download all repository indexes and in the box it says.. 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 connec (Hardware)