Instructions for installing libdvdcss on ubuntu 15.10
Installing libdvdcss
Legal warning: Check with your local laws to make sure usage of libdvdcss2 would be legal in your area.
From Ubuntu 15.10 onwards, libdvd-pkg is available to ease the installation of libdvdcss.
Install the libdvd-pkg package (no need to add third party repositories) via Synaptic or command line:
sudo apt-get install libdvd-pkg
Then run the following commands to complete the libdvdcss installation:
sudo apt-get update
sudo apt-get upgrade
Source
Step 1 - open terminal.
Step 2: - copy/paste into terminal:
sudo apt-get install libdvd-pkg
Step 3 - copy/paste into terminal:
sudo /usr/lib/libdvd-pkg/b-i_libdvdcss.sh
Step 4 - Hit Enter
Step 5 - Enter password
Step 6 - When installation is complete: close terminal.
Tested successfully on Ubuntu Mate 16.04.