title: docker missing var/lib/docker folder
body: <p>I was trying to do something, but I have accidentally deleted docker folder at var/lib/docker, and now I can not install another docker any more. What to do now? How can I fix this problem and install new docker. </p>
  
  <pre><code>sudo docker run hello-world
  Unable to find image 'hello-world:latest' locally
  latest: Pulling from library/hello-world
  9bb5a5d4561a: Pulling fs layer 
  docker: open /var/lib/docker/tmp/GetImageBlob974250330: no such file or directory.
  </code></pre>
  
  <p>See 'docker run --help'.</p>