here is a list of handy Ubuntu Linux DVD backup tools:

libdvdcss2 – without this you wouldn’t be able to access your DVDs at all. To install it you should first add the Medibuntu repositories then you could install it:

sudo apt-get install libdvdcss2

handbrake – high quality interface and wide options choice, optimumpresets! This is not available through Ubuntu standard repositories, however you can find a wide range of precompiled packages on its official website: http://handbrake.fr/downloads.php

ogmrip – very simple yet powerful interface. Has 3 handy quality presets (xvid, h264, lavc)

k9copy – despite being initially conceived only for shrinking DVD9 (also known as double layer DVDs) to fit on a common 4.5Gb DVD it actually enables you to encode the motion picture in several formats using either mencoder or ffmpeg. k9copy assistant is a very intuitive wizard that guides you in the process of ripping the movie.

shrinkta – DVD movie backup: extremely simple interface, too few customizable encoding options