How to read DVDs in Xubuntu

From this version of Ubuntu/Xubuntu, medibuntu repository does not exist. Therefore, you cannot get the libdvdcss4 package to install and watch DVDs on Xubuntu / Ubuntu 13.04.

To watch DVDs on this version of Ubuntu / Xubuntu, download the libdvdcss2 package from
http://www.videolan.org/developers/libdvdcss.html and install it.

The above steps can be replaced with the following from Xubuntu 14.04 LTS onwards

$ sudo apt-get install libdvdread4 <enter>
$ sudo /usr/share/doc/libdvdread4/install-css.sh <enter>