title: No package_facts from Ubuntu 18 server?
body: <p>I though package_facts module seemed useful but on a Ubuntu 18.04 server I get an "unsupported" message, is this a bug?</p>
  
  <pre><code>- name: get the rpm or apt package facts
    package_facts:
      manager: "auto"
  </code></pre>
  
  <p>output:</p>
  
  <pre><code>{"ansible_facts": {"packages": {}}, "changed": false, "msg": "Unsupported package manager: auto"}
  </code></pre>
  
  <p>If a change to manager "apt" I get:</p>
  
  <pre><code>FAILED! =&gt; {"changed": false, "msg": "Unable to use the apt python bindings, please ensure they are installed under the python the module runs under"}
  </code></pre>