我的系统是Ubuntu14.04 原来是Docker1.6 现在升级为Docker 1.7
$uname -a
Linux whw-virtual-machine 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

我的看的是官方的upgrade 的方法： https://docs.docker.com/installation/ubuntulinux/
Upgrade Docker
To install the latest version of Docker with wget:
$ wget -qO- https://get.docker.com/ | sh

结果显示报错：
$docker images
Error response from daemon: client and server don't have same version (client : 1.19, server: 1.18)