You can just say "sudo passwd" and set you own password for root or say "sudo su" in a shell to get a root prompt.When I want to work as root or do the knx-hdinstall I just boot the Knoppix cd and at the boot prompt say "knoppix 2" this boots me to a root prompt where I say "startx /usr/bin/fluxbox" and once at that desktop I just open an xterm and cd /usr/local/bin the run knx-hdinstall.