The docker.io package is already inside Ubuntu called docker.io [1], so itβs easy
sudo apt-get install docker.io
But if you follow this link that you gave and follow steps 7, 8, 9, then your installation will know about the package on the docker-engine repository and also find docker-engine .
Your call. I am running a version of Ubuntu (currently 0.11.2 on Ubuntu 16.04) on some machines, and the other with Docker on others (since I was interested in learning about some of the features of 0.12). Both will work just fine.
[1] Since docker used for docking icons for the application to run on the desktop.
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