W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/quantal-security/Release  Unable to find expected entry 'independent/source/Sources' in Release file (Wrong sources.list entry or malformed file)

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal/Release  Unable to find expected entry 'independent/source/Sources' in Release file (Wrong sources.list entry or malformed file)

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-updates/Release  Unable to find expected entry 'independent/source/Sources' in Release file (Wrong sources.list entry or malformed file)

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-backports/Release  Unable to find expected entry 'independent/source/Sources' in Release file (Wrong sources.list entry or malformed file)

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/quantal-proposed/Release  Unable to find expected entry 'independent/binary-amd64/Packages' in Release file (Wrong sources.list entry or malformed file)