I downloaded ubuntu-12.04-desktop-amd64.iso from http://releases.ubuntu.com/precise/
This page also has a link to file showing the respective MD5 hashes for each file
The page shows
128f0c16f4734c420b0185a492d92e52 *ubuntu-12.04-desktop-amd64.iso
But when I checked my downloaded ISO using the md5sum program I get
57876b3740ee89e75c8fefc93a7ceee6 *ubuntu-12.04-desktop-amd64.iso
I also downloaded the ISO via BitTorrent using http://releases.ubuntu.com/precise/ubuntu-12.04-desktop-amd64.iso.torrent
This time using md5sum for this file shows the correct hash 128f0c16f4734c420b0185a492d92e52, but the ISO is 732MB, not 698MB as shown on the release page.
What could be happening here?