http://askubuntu.com/questions/34074/how-do-i-change-my-username
mkdir ~/home/<newname> -p <password>
sudo adduser -U <newname>:<newnamegroup>
cp ~/home/<usertocopy ~/home/<newname> sudo -- usermod -l <newname> -d /home/<newname> -m <oldname>
sudo -- groupmod -n <newgroup> <oldgroup>