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# 1 .-
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

# 2 .-
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable"

# 3 .-
sudo apt-get update

# 4 .-
sudo apt-get install -y docker-ce

# 5.-
sudo systemctl status docker

# the output looks like:
# ● docker.service - Docker Application Container Engine
#    Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
#    Active: active (running) since Sun 2016-05-01 06:53:52 CDT; 1 weeks 3 days ago
#      Docs: https://docs.docker.com
#  Main PID: 749 (docker)