可能是ubuntu系统的问题，我使用apt-get install docker-ce 安装失败

参考下面官方网站安装。
https://www.docker.com/community-edition

使用uGet下载docker安装deb包
https://download.docker.com/linux/ubuntu/dists/xenial/pool/stable/amd64/docker-ce_17.12.1~ce-0~ubuntu_amd64.deb

安装 sudo dpkg -i docker-ce_17.12.1~ce-0~ubuntu_amd64.deb

然后sudo docker run hello-world
显示如下：
Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message,Docker took the following steps:

1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
   (amd64)
3. The Docker daemon created a new container from that image which runs the
   executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client,which sent it
   to your terminal.

To try something more ambitIoUs,you can run an Ubuntu container with:
$ docker run -it ubuntu bash

Share images,automate workflows,and more with a free Docker ID:
https://cloud.docker.com/

For more examples and ideas,visit:
https://docs.docker.com/engine/userguide/

Install from a package
If you cannot use Docker’s repository to install Docker CE,you can download the .deb file for your release and install it manually. You need to download a new file each time you want to upgrade Docker CE.

• Go to https://download.docker.com/linux/ubuntu/dists/,choose your Ubuntu version,browse to pool/stable/ and choose amd64,armhf,ppc64el,or s390x. Download the .deb file for the Docker version you want to install.

• Note: To install an edge package,change the word stable in the URL to edge. Learn about stable and edgechannels.

• Install Docker CE,changing the path below to the path where you downloaded the Docker package.
  $ sudo dpkg -i /path/to/package.deb

• The Docker daemon starts automatically.

• Verify that Docker CE is installed correctly by running the hello-world image.

• $ sudo docker run hello-world

• This command downloads a test image and runs it in a container. When the container runs,it prints an informational message and exits.Docker CE is installed and running. The docker group is created but no users are added to it. You need to use sudo to run Docker commands. Continue to Post-installation steps for Linux to allow non-privileged users to run Docker commands and for other optional configuration steps.
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