This is a screenshot Ubuntu MATE 16.04 playing the Blu-ray of Batman Begins using VLC.

I took the screenshot during a discussion in the Ubuntu MATE Community forums about how to get Blu-ray playback working. Blu-ray playback also works with Ubuntu MATE 15.10, if you do the following:

    sudo apt get install libaacs0 libbluray1 libbluray-bdj libbluray-bin libbdplus0 libdvdnav4 libdvdread4
    mkdir ~/.config/aacs/
    wget http://www.labdv.com/aacs/KEYDB.cfg -O ~/.config/aacs/KEYDB.cfg

Then use VLC to Open Disc and choose Blu-ray. My drive was on /dev/cdrom.
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