Ubuntu 우분투 14.04 docker 설치 $ sudo apt-get update $ sudo apt-get install -y docker-engine 을 하면 에러가 나고 아래와 같은 메시지를 만나게 됩니다. Reading package lists... Done Building dependency tree Reading state information... Done docker-engine is already the newest version. You might want to run 'apt-get -f install'