Ubuntu14 中安装Docker

我的机器是虚拟机Ubuntu14  

step 1:
apt-get  update 

step 2:

root@localhost:~# apt-get install docker.io
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
aufs-tools
Suggested packages:
btrfs-tools debootstrap lxc rinse
The following NEW packages will be installed:
aufs-tools docker.io
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 3,818 kB of archives.
After this operation, 22.5 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y

step3&4:

root@localhost:~# ln -sf /usr/bin/docker.io /usr/local/bin/docker
root@localhost:~# sed -i '$acomplete -F _docker docker' /etc/bash_completion.d/docker.io
root@localhost:~#

step5:

root@localhost:~#  docker run -i -t ubuntu /bin/bash
Unable to find image 'ubuntu' locally
Pulling repository ubuntu
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511136ea3c5a: Download complete