6.
From the desktop of the Live CD, open up a new Konsole window and then type:
ubiquity
bringing up the ubuntu system installer that is also used for Backtrack. Once its up it will give you an error (most likely), just click continue. Select your Country/timezone/state of residence, and your keyboard layout. Once thats done you should get a menu asking to divide the disk space up for “Ubuntu” (which it thinks is ubuntu.. but we are smarter than this stupid computer, we are sneaking a backtrack install into this drive, not an Ubuntu one 
)
Make sure to click the button that says
Guided – resize SCSI3 (0,0,0), partition #3 (sda) and use freed space
The move the slider so that Ubuntu takes as much if not all of the space on partition. Now before you click forward, go read the next step thoroughly as this part is crucial to do.
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I tend not to brag, but in the interest of bragging for bragging sake.. I only use one OS. Security Enhanced Linux – as endorsed by the NSA (theres an old saying “whats good for the goose..”).