How to install Docker CE on Ubuntu 18.04 (Community Edition)

Uninstall old versions

If you have installed an old version before, you need to uninstall it first:

$ sudo apt-get remove docker docker-engine docker.io containerd runc

Setting up a warehouse

Update apt package index:

$ sudo apt-get update

Enable apt to use the repository over HTTPS:

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

Add the official GPG key:

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

Verify your key:

$ sudo apt-key fingerprint 0EBFCD88 

Set which version to use.

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

I chose the test version.

Install

Update apt package index

$ sudo apt-get update

Start Installation

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

test

$ sudo docker run hello-world 

refer to

Get Docker Engine - Coummuntiy for Ubuntu

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