Here's what you can do, to start open a terminal window, you can do this through the Dash, or by keystroking "Ctrl + T". Afterwards, what you may want to do is copy and paste the following commands into terminal. You can also, if more comfortable, type them manually. You can copy one by one, or all at once, it doesn't matter. Remember, when in terminal the past command is "Ctrl + Shift + V" instead of "Ctrl + V".

sudo add-apt-repository ppa:n-muench/vlc

sudo apt-get update

sudo apt-get install libaacs0 libbluray-bdj libbluray1

sudo apt-get dist-upgrade

That will only get blu-ray to work in VLC. We now need aacs folders, and to download the keys. We just enter a couple more commands into terminal.

cd ~/

mkdir -p ~/.config/aacs/

cd ~/.config/aacs/ && wget http://vlc-bluray.whoknowsmy.name/files/KEYDB.cfg

You should be all set now, enjoy your blu-ray movies!

All information and alternative methods can be found here.