Step-by-step – Docker Installation in Ubuntu 20.04 Guide

Installing

3. 3. Preinstallation Testing

   Check if a Previous Docker Version is Installed
   With:

   which docker

   If Yes then Remove that with:

   sudo apt remove docker docker-engine

4. 4. Installing Packages

   Install PreRequisite Packages.

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

   Authenticate with the User Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo.

5. 5. Installing Docker CE

   Then to Install Docker CE
   Simply run:

   sudo apt install docker-ce

6. 6. Testing Docker CE

   Testing Docker Installation.

   With:

   sudo docker run hello-world

   Or:

   docker run hello-world

   Then Docker will Pull the Repo and Greets you with:
   Hello from Docker! :)

7. 8. Docker CE Getting Started

   How to Get Started with Docker and Docker Containers

   Docker Quick Start Guide

   Docker Quick Start for Linux