apt-get update W: Failed to fetchhttp://archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/binary-amd64/Packages Hash Sum mismatch W: Failed to fetchhttp://archive.ubuntu.com/ubuntu/dists/trusty-security/main/source/Sources Hash Sum mismatch E: Some index files failed to download. They have been ignored, or old ones used instead.
rm -rvf /var/lib/apt/lists/* apt-get -y update