This directory of Ubuntu ISOs is currently maintained by kchen.
  -- 2005-10-25

This directory is no longer regularly updated -- you may be interested
in grabbing ISOs from http://snork.mit.edu/ instead, which is an
Ubuntu apt and CD mirror.
  -- 2007-05-28

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From the Ubuntu web site (http://www.ubuntu.com/):

Ubuntu is a free, open source operating system that starts with the
breadth of Debian and adds regular releases (every six months), a
clear focus on the user and usability (it should "Just Work", TM) and
a commitment to security updates with 18 months of support for every
release. Ubuntu ships with the latest Gnome release as well as a
selection of server and desktop software that makes for a comfortable
desktop experience off a single installation CD.

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Instructions on how to make the Ubuntu install run Athena services
such as Kerberos, AFS, zephyr, and printing can be found at
http://stuff.mit.edu/afs/sipb.mit.edu/project/debian-athena/www/

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Section 3 of the GPL states:

  3. You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:

    a) Accompany it with the complete corresponding machine-readable
    source code, which must be distributed under the terms of Sections
    1 and 2 above on a medium customarily used for software interchange; or,

    b) Accompany it with a written offer, valid for at least three
    years, to give any third party, for a charge no more than your
    cost of physically performing source distribution, a complete
    machine-readable copy of the corresponding source code, to be
    distributed under the terms of Sections 1 and 2 above on a medium
    customarily used for software interchange; or,

    c) Accompany it with the information you received as to the offer
    to distribute corresponding source code.  (This alternative is
    allowed only for noncommercial distribution and only if you
    received the program in object code or executable form with such
    an offer, in accord with Subsection b above.)

Ubuntu has provided this offer on the CD folder:

"This software is released for free public use under several licenses.
It is provided without any warranty, without even the implied warranty
of merchantability or fitness for a particular purpose.  See the
license text included with each program for details.  Source code for
Ubuntu can be downloaded from archive.ubuntu.com or can be ordered
from Canonical at the cost of the media and shipping.  Ubuntu, the
Ubuntu logo and Canonical are registered trademarks of Canonical Ltd.
All other trademarks are the property of their respective owners."