Watching DVD in Linux (particularly Ubuntu)
"Ubuntu does not allow you to play DVD movie due to legal and
technical restrictions. You have to install the
ubuntu-restricted-extra package and run the libdvdread3 installer
script. Check the tutorial for detailed instruction.
For ripping DVD, I personally use Handbrake. It comes with several
preset profiles, including iPhone and PS3, that you can use to
quickly rip the DVD into your desired format.
"To install handbrake, download the deb file here.