[TriLUG] Download corruption

[Glenn Starling]

Before doing an upgrade from the AMD-64 version of Ubuntu 6.10 I decided
to download and burn a CD to use if I needed to reinstall should the
upgrade not work correctly.  I downloaded the file to the Downloads
directory off my home directory, and ran the md5sum program to check for
file corruption errors.  There was corruption, so I re-downloaded and
repeated the above.  Different numbers, but still no match to the
published MD5SUM results.  Note the md5sum command gave different
results the first and second time I ran it on the same .iso file which
had been downloaded.  After running md5sum a couple of times, the number
stabilizes.  See the results below.  Any ideas?

The published MD5SUM file contains this line:
a2b159599b69cea51371eee1ec5feda6 *ubuntu-7.04-desktop-amd64.iso

My results are:
glenn at penguin:~/Downloads$ md5sum ubuntu-7*
12ca7ddf4d000ad12a0323bc90391976  ubuntu-7.04-desktop-amd64.iso
glenn at penguin:~/Downloads$ md5sum ubuntu-7.04-desktop-amd64.iso
964495151ad214c10244ab67990ac972  ubuntu-7.04-desktop-amd64.iso
glenn at penguin:~/Downloads$ md5sum ubuntu-7*
564e426c7e90c4c5b215751932eaeb79  ubuntu-7.04-desktop-amd64.iso
glenn at penguin:~/Downloads$ md5sum ubuntu-7.04-desktop-amd64.iso
564e426c7e90c4c5b215751932eaeb79  ubuntu-7.04-desktop-amd64.iso
glenn at penguin:~/Downloads$