title: "Is your docker daemon up and running?" Problems with docker hello world tutorial on Linux
body: <p>I am running the installation tutorial for <a href="http://docs.docker.com/linux/step_one/" rel="nofollow noreferrer">Docker</a> on Linux - Ubuntu 14.04</p>
  
  <p>Going step by step through the tutorial, I get the following error message:</p>
  
  <pre><code>docker run hello-world
  
  Post http:///var/run/docker.sock/v1.20/containers/create: dial unix /var/run/docker.sock: no such file or directory.
  * Are you trying to connect to a TLS-enabled daemon without TLS?
  * Is your docker daemon up and running?
  </code></pre>
  
  <p>The similar question <a href="https://stackoverflow.com/questions/25372781/docker-error-var-run-docker-sock-no-such-file-or-directory">docker error: /var/run/docker.sock: no such file or directory</a> refers to <code>boot2docker</code> which I am not using</p>