[ubuntu] Update returns an error

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http://ubuntuforums.org – I'm running 10.04 and it shows an error when I try to update. Failed to fetch http://ppa.launchpad.net/mozillateam...86/Packages.gz 404 Not Found Some index files failed to download, they have been ignored, or old ones used instead. Is there a problem with the repository, or do I need to remove this one? Thanks for any and all help. (Hardware)