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我认为这更好：
sudo apt-get install docker
但为什么不选择一个明确的名字？
最佳答案
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.
有关最新版本的完整安装说明,请参见https://docs.docker.com/engine/installation/linux/ubuntulinux/.
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转载注明原文：为什么在ubuntu上安装docker应该是`sudo apt-get install docker.io`？ - 乐贴网
