Ok, I thought you had forgotten the "root" password. Which
I guess in Ubuntu you actually don't enter a "root" password
but are given root privileges with sudo. If you have your
load CD, can't you boot from that and mount the drive and
edit the password file removing the password there? Oh wait
in this version you can't see the password field can you?
Can you run the password command while on the live CD directed
to the main drive? Can you get to single user, in Unix you
could boot to single user on the console and not be asked for
the password and administer the system that way.
Yes, sometime during the old-timers moments I can remember
things but then again it is a pleasure watching TV now, not
that many reruns.