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Can not install updates on ubuntu 12.04 LTS!

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http://askubuntu.com – Here is what i get when trying to install the update: first I get a window message with all this: W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/main/source/Sources 403 Forbidden , W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://archive.canonical.com/ubuntu/dists/natty/partner/source/Sources 403 Forbidden , W:Failed to fetch http://archive.canonical.com/ubuntu/dists/natty/partner/b (HowTos)