I keep getting this failed message and I don't know how to fix it. These are the details in the error:
W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/universe/source/Sources 404 Not Found [IP: 2001:67c:1562::15 80]
W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/main/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1562::15 80]
W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/restricted/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1562::15 80]
W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/universe/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1562::15 80]
W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/multiverse/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1562::15 80]
W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/restricted/binary-i386/Packages 404 Not Found [IP: 2001:67c:1562::15 80]
W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/universe/binary-i386/Packages 404 Not Found [IP: 2001:67c:1562::15 80]
W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/multiverse/binary-i386/Packages 404 Not Found [IP: 2001:67c:1562::15 80]
E:Some index files failed to download. They have been ignored, or old ones used instead.
