1. Open a terminal window.
2. Execute the following terminal command to install the necessary packages

   sudo apt-get install totem-xine libxine1-ffmpeg libdvdread3

3. Execute the following terminal command

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

After you have done the above excercise, insert a DVD into your drive. Totem will open and the movie will be played.