Moment ago and I got this from VLC media player
Playback failure:
DVDRead could not open the disc "/dev/dvd".
Your input can't be opened:
VLC is unable to open the MRL 'dvd:///dev/dvd'. Check the log for details.
I typed this command to enable DVD playback, It worked on my desktop with Ubuntu 13.10
sudo apt-get install gstreamer0.10-plugins-ugly gstreamer0.10-ffmpeg libxine1-ffmpeg gxine mencoder libdvdread4 totem-mozilla icedax tagtool easytag id3tool lame nautilus-script-audio-convert libmad0 mpg321 && sudo /usr/share/doc/libdvdread4/install-css.sh
I am using Ubuntu 13.10 32-bit. Thanks