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You need to install Docker and git.
	If docker is installed but not active (started) this command will start it:
	
sudo systemctl start docker
Download learn like so:
    git  clone  https://github.com/goblimey/learn-unix
That creates a directory called learn-unix
containing the learn software.
Change directory to learn-unix and build the software like so:
    cd  learn-unix
    docker  build  .  -t  learnunix
(That's docker space build space
dot space hyphen t space learnunix.)
That last command will take a few minutes and display a running commentary. If all goes well, the last few lines should be something like:
    Successfully built 446990c342ad
    Successfully tagged learnunix:latest
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