[ubuntu] update manager error?

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http://ubuntuforums.org – I keep getting an triangle with a ! within it beside the mail icon. Code: W:Failed to fetch http://ppa.launchpad.net/claudiocn/slm/ubuntu/dists/precise/main/source/... 404  Not Found, W:Failed to fetch http://ppa.launchpad.net/claudiocn/slm/ubuntu/dists/precise/main/binary-... 404  Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead. Is what im getting in the Update Manager when i click Check Is this normal? Thanks in advance Solution: Remove them from the update manager repository list. Is this becaus (Hardware)