Docker 1.8+ after Ubuntu installs the specified version Docker-engine

This way the Ubuntu installation process, first of all the official website documents

2. If you haven ' t already do so, log into your Ubuntu instance.

4. Open a terminal window.

6. ADD the new gpg key.

   58118E89F3A912897C070ADBF76221572C52609D

8. Open the /etc/apt/sources.list.d/docker.list file in your favorite editor.

   If the file doesn ' t exist, create it.

10. Remove any existing entries.

12. Add an entry for your Ubuntu operating system.

    The possible entries is:

    # Ubuntu Precisedeb https://apt.dockerproject.org/repo ubuntu-precise main# Ubuntu Trustydeb https://apt.dockerproject.org/repo ubuntu-trusty main# Ubuntu Vividdeb https://apt.dockerproject.org/repo ubuntu-vivid main# Ubuntu Wilydeb https://apt.dockerproject.org/repo ubuntu-wily main

14. Save and close the /etc/apt/sources.list.d/docker.list file.

16. Update the package apt index.

    $ apt-get update

18. Purge the old repo if it exists.

    $ apt-get purge lxc-docker*

20. Verify that's pulling from the right apt repository.

    $ apt-cache policy docker-engine

~# Apt-cache Policy docker-Enginedocker-engine:installed:1.8.3-0~Precise candidate:1.8.3-0~wily Version table:1.8.3-0~wily0         -Https//apt.dockerproject.org/repo/ubuntu-wily/main AMD64 Packages     1.8.3-0~vivid0         -Https//apt.dockerproject.org/repo/ubuntu-vivid/main AMD64 Packages     1.8.3-0~trusty0         -Https//apt.dockerproject.org/repo/ubuntu-trusty/main AMD64 Packages***1.8.3-0~precise0         -Https//apt.dockerproject.org/repo/ubuntu-precise/main AMD64 Packages         -/var/lib/dpkg/Status1.8.2-0~wily0         -Https//apt.dockerproject.org/repo/ubuntu-wily/main AMD64 Packages     1.8.2-0~vivid0         -Https//apt.dockerproject.org/repo/ubuntu-vivid/main AMD64 Packages     1.8.2-0~trusty0         -Https//apt.dockerproject.org/repo/ubuntu-trusty/main AMD64 Packages     1.8.2-0~precise0         -Https//apt.dockerproject.org/repo/ubuntu-precise/main AMD64 Packages     1.8.1-0~wily0         -Https//apt.dockerproject.org/repo/ubuntu-wily/main AMD64 Packages     1.8.1-0~vivid0         -Https//apt.dockerproject.org/repo/ubuntu-vivid/main AMD64 Packages     1.8.1-0~trusty0         -Https//apt.dockerproject.org/repo/ubuntu-trusty/main AMD64 Packages     1.8.1-0~precise0         -Https//apt.dockerproject.org/repo/ubuntu-precise/main AMD64 Packages     1.8.0-0~wily0         -Https//apt.dockerproject.org/repo/ubuntu-wily/main AMD64 Packages     1.8.0-0~vivid0         -Https//apt.dockerproject.org/repo/ubuntu-vivid/main AMD64 Packages     1.8.0-0~trusty0         -Https//apt.dockerproject.org/repo/ubuntu-trusty/main AMD64 Packages     1.8.0-0~precise0         -Https//apt.dockerproject.org/repo/ubuntu-precise/main AMD64 Packages     1.7.1-0~wily0         -Https//apt.dockerproject.org/repo/ubuntu-wily/main AMD64 Packages     1.7.1-0~vivid0         -Https//apt.dockerproject.org/repo/ubuntu-vivid/main AMD64 Packages     1.7.1-0~trusty0         -Https//apt.dockerproject.org/repo/ubuntu-trusty/main AMD64 Packages     1.7.1-0~precise0         -Https//apt.dockerproject.org/repo/ubuntu-precise/main AMD64 Packages     1.7.0-0~vivid0         -Https//apt.dockerproject.org/repo/ubuntu-vivid/main AMD64 Packages     1.7.0-0~trusty0         -Https//apt.dockerproject.org/repo/ubuntu-trusty/main AMD64 Packages

Finally, a docker-engine version of a specific release is selected for installation

Install -y docker-engine=1.8. 1-0~precise

Docker 1.8+ after Ubuntu installs the specified version Docker-engine