So when i try to install Amnesia:the dark decent from the software center, or when i run the ordinary system updates i get this message.

Code:
W:Failed to fetch https://private-ppa.launchpad.net/commercial-ppa-uploaders/amnesia/ubuntu/dists/precise/main/binary-amd64/Packages  The requested URL returned error: 401
, W:Failed to fetch https://private-ppa.launchpad.net/commercial-ppa-uploaders/amnesia/ubuntu/dists/precise/main/binary-i386/Packages  The requested URL returned error: 401
, E:Some index files failed to download. They have been ignored, or old ones used instead.
I can't install the game.

I'm not sure how to solve this problem, but is has something to do with the repositories for Amnesia.