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This is the message it gives me:

W:Failed to fetch http://ppa.launchpad.net/sevenmachines/flash/ubuntu/dists/quantal/main/source/Sources 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/sevenmachines/flash/ubuntu/dists/quantal/main/binary-i386/Packages 404 Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead.

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1 Answer 1

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Those ppas are being outdated or not properly set up. For the time being uncheck (do not remove completely) those ppas -> save and then in terminal do sudo apt-get update

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