One of the harder things to get working in Ubuntu is DVD playback. However, there is a little known script that will install what you need for this functionality.

sudo /usr/share/doc/libdvdread3/install-css.sh

This will install what you need to play the DVD’s. However, Totem itself just sucks at playing DVD menus. So run the following command to install VLC and use that to play DVDs as it supports DVD menus.

sudo apt-get install vlc