BackTrack is based on Ubuntu, so to answer your question in short yes.
However, it will take time to do all of this. You will need to download/install them 1 at a time.
I would just recommend putting BackTrack on a USB or a VM, and if you must, just daul/tri boot. I mean if you want to throw everything from BackTrack onto Ubuntu, why not just use BackTrack. The obvious answer is that Ubuntu is more stable. I haven't tested it, but if you put everything from BackTrack onto Ubuntu, I would probably guess it to have the same effect anyways.
1. No system is safe.
2. Aim for the the impossible.
3. Have fun in cyberspace and meatspace.
For those that know