title: Docker build "Could not resolve 'archive.ubuntu.com'" apt-get fails to install anything
body: <p>I've been trying to run Docker build on various files which previously worked before, which are now no longer working.</p>
  
  <p>As soon as the Docker file included any line that was to install software it would fail with a message saying that the package was not found.</p>
  
  <pre><code>RUN apt-get -y install supervisor nodejs npm
  </code></pre>
  
  <p>The common message which showed up in the logs was </p>
  
  <pre><code>Could not resolve 'archive.ubuntu.com'
  </code></pre>
  
  <p>Any idea why any software will not install?</p>