Try:
Not sure if BT5 has adduser, if it hasn't, read:

will you lease explain?
An also tell me how and why we add user in group?

I really think you should follow the advice I gave you in an earlier thread. Here:
http://www.linuxquestions.org/questi...9/#post5016838

you really DO NOT want to

all the tools you would need. need to be ran as root !
THAT IS WHY this is set up this way
username :root
password : toor

and it is a live dvd

you will not be saving any settings between reboots
- unless it is a live image on a usb thumb drive with persistence


also bt5 is unsupported , and very OLD it is built on top of Ubuntu 10.04

PS. and you can not upgrade to 12.10 as the apper pop up informs you to do
if you do you will kill all the added tools
and have a broken install , not much will be left that still works