Problems after upgrading Docker on Ubuntu

  docker, question

My system is Ubuntu14.04, originally Docker1.6, now upgraded to 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

What I am looking at is the official upgrade method:
Upgrade Docker
To install the latest version of Docker with wget:
$ wget -qO-| sh

The results show that an error was reported:
$docker images
Error response from daemon: client and server don’t have same version (client : 1.19, server: 1.18)

OK, this problem was solved later. Just restart it. I restarted the computer directly. . . I haven’t tried to restart Docker.