[ubuntu] Update problems please help !

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http://ubuntuforums.org – i keep getting this error Failed to fetch http://ppa.launchpad.net/ferramrober...source/Sources 404 Not Found Failed to fetch http://ppa.launchpad.net/ferramrober...amd64/Packages 404 Not Found Failed to fetch http://ppa.launchpad.net/ferramrober...-i386/Packages 404 Not Found Some index files failed to download. They have been ignored, or old ones used instead. (Hardware)