Ubuntu 12 LTS

apt-key adv --keyserver hkp://pgp.mit.edu:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
sh -c "echo deb https://apt.dockerproject.org/repo ubuntu-precise main \
> /etc/apt/sources.list.d/docker.list"
apt-get purge lxc-docker
apt-get update
apt-get install docker-engine
 
sudo usermod -aG docker username

For latest refer to: https://github.com/docker/compose/releases

#sudo curl -L "https://github.com/docker/compose/releases/download/1.23.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose