Ubuntu にリポジトリから最新のDocker をインストールする

InstallDockerInUbuntu.sh

#!/bin/bash -eu

# Reference https://docs.docker.com/engine/installation/ubuntulinux/

[ "$(id -u)" != "0" ] && echo "You must run this script as root." && exit 1
. /etc/os-release
[ "${NAME,,}" != "ubuntu" ] && echo "Sorry, this script doesn't support the distribution $NAME" && exit 1
apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
. /etc/lsb-release
echo "deb https://apt.dockerproject.org/repo ubuntu-${DISTRIB_CODENAME,,} main" > /etc/apt/sources.list.d/docker.list
apt-get update
apt-get -y purge lxc-docker || true
sudo apt-get -y install linux-image-extra-$(uname -r) docker-engine