Quote Originally Posted by hal8000
As you've installed 5.1 as a live CD install then rebooting should regenerate the profile from /etc/skel

If I remember there was a sudo type error in knoppix 5.1 that prevented programs running as root as sudo
Open a terminal and type su
then
whoami
(not sure if this will give you root access but no root password is set.

Thanks, I'll give that a try.