Installing docker and docker-compose on ubuntu 18.04

docker_ubuntu_18_04.sh

#docker engine
sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates
sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
sudo apt-add-repository 'deb https://apt.dockerproject.org/repo ubuntu-xenial main'
sudo apt-get update
sudo apt-get purge lxc-docker
sudo apt-get install -y docker-engine
sudo service docker start

#docker compose
cd ~ && curl -OL https://github.com/docker/compose/releases/download/1.8.1/docker-compose-`uname -s`-`uname -m` && sudo chmod a+x docker-compose-`uname -s`-`uname -m` && sudo mv `pwd`/docker-compose-`uname -s`-`uname -m` /usr/local/bin/docker-compose
docker-compose --version

sudo groupadd docker
sudo usermod -aG docker $USER
#Log out and log back in.
docker run hello-world
#If this fails with a message similar to this:
#Cannot connect to the Docker daemon. Is 'docker daemon' running on this host?
#Check that the DOCKER_HOST environment variable is not set for your shell. If it is, unset it.