wget http://old-releases.ubuntu.com/releases/12.04.5/MD5SUMS wget http://old-releases.ubuntu.com/releases/12.04.5/SHA256SUMS For MD5 (legacy, but provided):
sha256sum ubuntu-12.04.5-desktop-amd64.iso grep "ubuntu-12.04.5-desktop-amd64.iso" SHA256SUMS A successful verification shows matching hash strings. Example fragment from SHA256SUMS : ubuntu 12.04 iso download
md5sum ubuntu-12.04.5-desktop-amd64.iso diff MD5SUMS <(echo "$(md5sum ubuntu-12.04.5-desktop-amd64.iso)") wget http://old-releases