Ubuntu 16.04 - > ERROR: Couldn't connect to Docker daemon - you might need to run `docker-machine start default`
<p>I am getting error on ubuntu 16.04</p>

<blockquote>
  <p>"ERROR: Couldn't connect to Docker daemon - you might need to run
  <code>docker-    machine start default</code>. "</p>
</blockquote>

<p>when i run following command</p>

<pre><code>sudo docker-compose up
</code></pre>

<p>Can any one answer ?</p>