[dheera]

Why not just:

    sudo apt install docker.io

And for more up-to-date versions, why doesn't Docker create a ppa? At most it should be something of the sort of:

    sudo apt-add-repository ppa:docker/docker
    sudo apt install docker

That's how these things were intended to work.

[paxswill]

PPA's are just Ubuntu's way to make creating APT repositories easier. Those steps above are the longer way of achieving the same result without relying on Canonical's infrastructure. The same instructions can also be used with minor changes to also work on Debian and Raspbian (and could probably work on most other Debian-based distros).

Those steps above are covering all the bases for Debian-based distros, adding the signing keys Docker uses for their packages, and then finally inst