Simplest way to install Docker


        
            
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            Download the convenience script and test:
curl -fsSL https://get.docker.com -o get-docker.sh
sudo sh ./get-docker.sh --dry-run
If all seems well, proceed with the install:
sudo sh get-docker.sh
Now test the install via a regular user account:
sudo usermod -aG docker J2897
newgrp docker
docker run hello-world

Note: The id command is useful for checking group membership.