Installing docker in Virtual Box Ubuntu

      sudo apt-get update

      sudo apt-get install apt-transport-https ca-certificates curl software-properties-common

      curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

      sudo apt-key fingerprint 0EBFCD88

      sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

      sudo apt-get update

      sudo apt-get install docker-ce

      apt-cache madison docker-ce

      sudo apt-get install docker-ce=18.06.1~ce~3-0~ubuntu

      sudo docker run hello-world