Install docker CE on Linux Mint 18.3

install-docker.sh

#!/usr/bin/env bash

# https://docs.docker.com/install/linux/docker-ce/ubuntu/
sudo apt-get install apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable"
sudo apt-get update
sudo apt-get install docker-ce

# https://docs.docker.com/compose/install/
sudo curl -L https://github.com/docker/compose/releases/download/1.20.0/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose

# https://docs.docker.com/install/linux/linux-postinstall/
sudo groupadd docker
sudo usermod -aG docker $USER

2020 Still works perfect. Thank you so much!

If someone has an error like Couldn't connect to Docker daemon at http+docker://localhost - is it running?

try
sudo chown $USER /var/run/docker.sock