apt-get upgrade
apt-get install apt-transport-https ca-certificates
apt-key adv --keyserver-options http-proxy="http://11.32.1.20:808" --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
vim /etc/apt/sources.list.d/docker.list
deb https://apt.dockerproject.org/repo ubuntu-xenial main
● On Ubuntu Precise 12.04 (LTS)
deb https://apt.dockerproject.org/repo ubuntu-precise main
● On Ubuntu Trusty 14.04 (LTS)
deb https://apt.dockerproject.org/repo ubuntu-trusty main
● Ubuntu Wily 15.10
deb https://apt.dockerproject.org/repo ubuntu-wily main
● Ubuntu Xenial 16.04 (LTS)
deb https://apt.dockerproject.org/repo ubuntu-xenial main
apt-get update
apt-get purge lxc-docker
apt-cache policy docker-engine
apt-get install linux-image-extra-$(uname -r)
apt-get install docker-engine
