I maintain xda-developers forum threads to work on these two specific projects. please direct your queries in regard to these topics on individual thread.
- Ubuntu on X10i
- Backtrack on X10i/universal
BackTrack arm image was launched suggesting to be only installable on Tablet devices specifically Xoom tablet.
This was the first implementation on a handset within 24hrs of launch of bt arm image.
Note : at this point this project is dead from development prespective, people can still access the images and download them.