I think this is better:
sudo apt-get install docker
But why didn't choose a clearly name?
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http://blog.docker.com/2014/04/docker-in-ubuntu-ubuntu-in-docker/
Why do Ubuntu use docker-engine as executable name instead of just docker? Tutorials, blog posts all now have to mention this difference, “if you use Ubuntu 14.04, or if you are with rest of the world (including earlier versions of Ubuntu)”. Why?
This is because of a Debian/Ubuntu policy; there is already a program called “docker” [1], and it was not allowed to use the same binary name.
Full installation instructions for the most-recent version are at https://docs.docker.com/engine/installation/linux/ubuntulinux/.
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And more recently, the package name may have changed again to "docker-engine" http://stackoverflow.com/questions/35031416/ – Thilo Jan 31 '16 at 12:23
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I've edited @Thilo's comment to match, since I just shot myself in the foot by not reading the comments. – Joe McMahon Jun 27 '16 at 22:50
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So... all dummy must to uninstall the "opportunistdocker", do `apt purge docker` – Peter Krauss Jul 20 '18 at 22:15
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issue this to install docker on ubuntu for your development boxes
curl -sSL https://get.docker.com/ | sh -y
if you want very latest dev release then issue
curl -fsSL https://test.docker.com/ | sh
when running either of above you will notice this walks through the same steps as listed in canonical docker install doc https://docs.docker.com/engine/installation/linux/ubuntulinux/ which is very handy when installing docker on remote servers and should be used for production boxes
Scott Stensland
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1According to notes at docs.docker.com these scripts are only recommended for developments environments. – ostergaard Oct 16 '18 at 20:20