install docker in ubuntu 12.04 x86

install-docker.sh

sudo sh -c "wget -qO- https://get.docker.io/gpg | apt-key add -"

# Add the Docker repository to your apt sources list.
sudo sh -c "echo deb http://get.docker.io/ubuntu docker main\
> /etc/apt/sources.list.d/docker.list"

# Update your sources
sudo apt-get update

# Install, you will see another warning that the package cannot be authenticated. Confirm install.
sudo apt-get install -y lxc-docker