Playing Encrypted DVDs
To play encrypted DVDs, the libdvdcss2 package is essential. libdvdcss is a simple library designed for accessing DVDs like a block device without having to bother about the decryption.
Below are the instructions for installing the packages using the command line.
With the entire Medibuntu repository
Adding the repository
The following bash command adds Medibuntu's repository to Ubuntu. It also adds Medibuntu's GPG key to your keyring, which is needed to authenticate the Medibuntu packages.
This command should be run in the Terminal :
sudo wget --output-document=/etc/apt/sources.list.d/medibuntu.list http://www.medibuntu.org/sources.list.d/$(lsb_release -cs).list && sudo apt-get --quiet update && sudo apt-get --yes --quiet --allow-unauthenticated install medibuntu-keyring && sudo apt-get --quiet update
If you have added the entire Medibuntu repository, you just need to install the package using APT:
sudo apt-get install libdvdcss2
With individual packages
If you wish to install just libdvdcss2, you can first download the individual package and then install the package.
i386:
wget -c http://packages.medibuntu.org/pool/free/libd/libdvdcss/libdvdcss2_1.2.9-2medibuntu4_i386.deb
sudo dpkg -i libdvdcss2_1.2.9-2medibuntu4_i386.deb
amd64:
wget -c http://packages.medibuntu.org/pool/free/libd/libdvdcss/libdvdcss2_1.2.9-2medibuntu4_amd64.deb
sudo dpkg -i libdvdcss2_1.2.9-2medibuntu4_amd64.deb
Source How to add a mediubuntu repository
ubuntu restricted extra
packages. – Manuel Andrés Vélez Oct 25 '11 at 17:24