Install docker engine 1.12 on Ubuntu 16.04

install-docker.sh

#!/bin/bash

sudo apt-get update
sudo apt-get install \
    linux-image-extra-$(uname -r) \
    linux-image-extra-virtual -y
sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    software-properties-common -y

curl -fsSL 'https://sks-keyservers.net/pks/lookup?op=get&search=0xee6d536cf7dc86e2d7d56f59a178ac6c6238f52e' | sudo apt-key add -
sudo add-apt-repository \
   "deb https://packages.docker.com/1.12/apt/repo/ \
   ubuntu-$(lsb_release -cs) \
   main"
sudo apt update
sudo apt-get -y install docker-engine=1.12.6~cs13-0~ubuntu-xenial
sudo usermod -a -G docker $USER