I just downloaded ubuntu-14.04.1-desktop-amd64.iso from the official website and ran a MD5 checksum d2b966f36e76486ff4c83fb085557f97 which doesn't match any of the MD5 checksums listed at http://releases.ubuntu.com/14.04.1/MD5SUMS.
I checked the download link, it's http://ubuntu.excellmedia.net/releases/14.04.1/ubuntu-14.04.1-desktop-amd64.iso. Apparently Ubuntu's official website (which is where I initially went) chose the server for me because it's closest to me.
Is this a reliable server? Should I download from http://releases.ubuntu.com instead? Am I doing something wrong? Should I just download the file again?