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sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates
sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
sudo sh -c "echo 'deb https://apt.dockerproject.org/repo ubuntu-wily main' > /etc/apt/sources.list.d/docker.list"
sudo apt-get update
sudo apt-get install -y linux-image-extra-$(uname -r)
sudo apt-get update
sudo apt-get install -y docker-engine

sudo usermod -aG docker <username> # no sudo
sudo systemctl enable docker # autostart
sudo service docker start 

# check the installation
docker run hello-world