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[ubuntu] Update Manager : Failed to download repository information

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http://ubuntuforums.org – Hello everyone, For the past week, whenever I try to update via the Update Manager, I get the following errors: Code: [W:Failed to fetch http://ppa.launchpad.net/pmcenery/ppa/ubuntu/dists/precise/main/source/S... 404  Not Found , W:Failed to fetch http://ppa.launchpad.net/pmcenery/ppa/ubuntu/dists/precise/main/binary-i... 404  Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead. Here is the screenshot: My internet connection works perfectly as I am able to access this forum. I don't understand the sou (Hardware)