Talk:Ripping DVDs on Ubuntu Linux
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Ubuntu 14.04 doesn't provide libdvdcss in repositories so you need to add vlc ppa to the sources.list so you can download it.
sudo rm /etc/apt/sources.list.d/medibuntu.list curl ftp://ftp.videolan.org/pub/debian/videolan-apt.asc | sudo apt-key add - echo "deb ftp://ftp.videolan.org/pub/debian/stable ./" | sudo tee /etc/apt/sources.list.d/libdvdcss.list sudo apt-get update sudo apt-get install libdvdcss2