==== Install nVidia driver in Debian ====
  $ sudo nano /etc/apt/sources.list
<file>deb http://httpredir.debian.org/debian jessie-backports main contrib non-free</file>
  $ sudo apt-get update
  $ sudo apt-get install linux-headers-$(uname -r|sed 's,[^-]*-[^-]*-,,')
  $ sudo apt-get install -t jessie-backports nvidia-driver