[ubuntu_studio] Failed to update

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http://ubuntuforums.org – I managed to get my system to update and it had a succesful reboot but with a message. I fallowed what it said and got this; W:Failed to fetch http://ppa.launchpad.net/robert-ance...-i386/Packages 404 Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead. What does this mean?:confused: (Hardware)