Pack existing ubuntu installation to iso

How would you pack a current installation of linux to an iso that can be used to boot from?

What I'm trying to do is have my current ubuntu installation on a dvd and whenever I'm using a different computer, I could boot from the dvd and have my whole environment already there.

From stackoverflow

• Use Remastersys. It does exactly what you want and the two times I tried it, I did not bump into any issues

  solomongaby : thanks a lot for that link ... you just made my day :D

  Andrei Serdeliuc : Excellent, thanks!