If for some reason you’re unsatisfied with the Android experience on your NOOK Tablet – fret not, the folks over at XDA-developers are working on solution. AdamOutler and Loglud are trying to bring the popular Linux distro, Ubuntu, to the Android tablet. At the moment it’s only possible via a VNC (Virtual Network Computing Server), hence the “lite” name in the title, which ruins the whole experience due to lag. But all that should go away once they’ve successfully turned it into a flashable custom ROM for the tablet.
In the mean time you can check out a video demonstration of how Ubuntu would work on the NOOK Tablet: