I found an old version of Remastersys which was compatible with Ubuntu from versions 6.06 to 7.10, so I have decided to release a disc image of Ubuntu 6.06 LTS which has had all final updates installed.
Ubuntu 6.06 LTS was released in June 2006 and was supported until June 2009 on desktops and June 2011 on servers.
In order to download the updates, I have to change the reporitories to point to old-releases.ubuntu.com.
This is just plain old Ubuntu 6.06 without any proprietary codecs installed, although they can be installed in Synaptic Package manager. (Just look for gstreamer-plugins-good, gstreamer-plugins-bad, and gstreamer-plugins-ugly.)
To download Ubuntu 6.06 Final Edition, click here.