W:Failed to fetch gzip:/var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_precise_main_source_Sources  Hash Sum mismatch
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_precise_universe_source_Sources  Hash Sum mismatch
, E:Some index files failed to download. They have been ignored, or old ones used instead.