Someone has kindly sent me a couple of disks:
Ubuntu 12.10 Desktop and Ubuntu 12.10 Server.
I note that the desktop version needs at least 768MB of RAM, but the Server Edition needs only 256MB of RAM.
At present, I have 512MB of RAM installed on my pc.
I realise that the Desktop edition will probably not run, but I was wondering if I could try the Server Edition on my desktop - not install, just try.