NOTE: In Ubuntu, depending on your version, replace libdvdcss2 with what you find on this page.
https://help.ubuntu.com/community/RestrictedFormats/PlayingDVDs
+NOTE: After apt-get install on Ubuntu you may need to run this:
+ sudo /usr/share/doc/libdvdread4/install-css.sh
+
Specific Executable (program) Dependencies (must be found in $PATH):
volname makexml lsdvd dvdauthor ddrescue dvdbackup mencoder mplayer mkisofs