Docker installation steps on Ubuntu16.04

DockerINSTALL

sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates

# Add new GPG key
sudo apt-key adv \
               --keyserver hkp://ha.pool.sks-keyservers.net:80 \
               --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
               
# If the above keyserver is not available, try hkp://pgp.mit.edu:80 or hkp://keyserver.ubuntu.com:80.

echo "deb https://apt.dockerproject.org/repo ubuntu-xenial main" | sudo tee /etc/apt/sources.list.d/docker.list
sudo apt-get update

# Verify apt is pulling from the right repository
apt-cache policy docker-engine

sudo apt-get install linux-image-extra-$(uname -r) linux-image-extra-virtual

# Install docker engine
sudo apt-get install docker-engine

# Start docker engine
sudo service docker start

# Verify installation
sudo docker run hello-world

# Manage docker as non sudo user
sudo groupadd docker
sudo usermod -aG docker $USER
gnome-session-quit