Install Docker and Docker Compose to Ubuntu 14.04 LTS.

provision.sh

#!/bin/bash

# https://docs.docker.com/engine/installation/linux/ubuntulinux/
sudo apt-get update
sudo apt-get -y install apt-transport-https ca-certificates
sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
sudo bash -c 'echo "deb https://apt.dockerproject.org/repo ubuntu-trusty main" > /etc/apt/sources.list.d/docker.list'
sudo apt-get update
sudo apt-get -y install linux-image-extra-$(uname -r)
sudo apt-get -y install docker-engine

sudo usermod -aG docker vagrant

# https://docs.docker.com/compose/install/
sudo bash -c 'curl -L https://github.com/docker/compose/releases/download/1.6.2/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose'
sudo chmod +x /usr/local/bin/docker-compose

Thank you.

it seems that docker-engine is not available now, you can try: sudo apt-get install docker-ce=17.12.1ce-0ubuntu