AttributeError: 'NoneType' object has no attribute 'loader' : <p>having an issue today when I started up my laptop (Ubuntu 18.4) and trying to use pip to install packages, I'm met with this error:</p>

<pre><code>Error processing line 3 of /home/cjones/.local/lib/python3.6/site-packages/googleapis_common_protos-1.5.8-py3.6-nspkg.pth:

  Traceback (most recent call last):
    File "/usr/lib/python3.6/site.py", line 174, in addpackage
      exec(line)
    File "&lt;string&gt;", line 1, in &lt;module&gt;
    File "&lt;frozen importlib._bootstrap&gt;", line 568, in module_from_spec
  AttributeError: 'NoneType' object has no attribute 'loader'

Remainder of file ignored
</code></pre>

<p>I don't think I changed anything since last successful boot but it seems as though something is missing... can anyone help?</p>
