Install Docker di Ubuntu 18.04

$ sudo apt-get update

$ sudo apt-get install \
  apt-transport-https \
  ca-certificates \
  curl \
  gnupg-agent \
  software-properties-common

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

$ sudo apt-key fingerprint 0EBFCD88
    
  pub   rsa4096 2017-02-22 [SCEA]
        9DC8 5822 9FC7 DD38 854A  E2D8 8D81 803C 0EBF CD88
  uid           [ unknown] Docker Release (CE deb) 
  sub   rsa4096 2017-02-22 [S]

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

Install Docker Community Edition

$ sudo apt-get update

$ sudo apt-get install docker-ce docker-ce-cli containerd.io

$ sudo docker run hello-world

Sumber: https://docs.docker.com/install/linux/docker-ce/ubuntu/