Can't install Ubuntu one

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http://askubuntu.com – While trying to install Ubuntu one it throwes me this error - W:Failed to fetch http://ppa.launchpad.net/rabbitvcs/ppa/ubuntu/dists/DISTIBUTION/main/bin... 404 Not Found, W:Failed to fetch http://ppa.launchpad.net/rabbitvcs/ppa/ubuntu/dists/DISTRIBUTION/main/bi... 404 Not Found, E:Some index files failed to download. They have been ignored, or old ones used instead. and I can't install it Thanks. (HowTos)