title: Ubuntu 18.04 "ModuleNotFoundError: No module named 'boto3'" after "pip install boto3"?
body: <p>This appears to be a new problem in Ubuntu 18.04... I don't have this problem in Ubuntu 16.04.</p>
  
  <p>I'm unable to use <code>import boto3</code> in my Python scripts. This is the error:</p>
  
  <pre><code>ModuleNotFoundError: No module named 'boto3'
  </code></pre>
  
  <p>I'm getting the error AFTER successfully completing <code>pip install boto3</code>.</p>
  
  <p>The machine is a fresh install of Ubuntu 18.04. I'm using the <code>/usr/bin/python3</code> that came with it.</p>
  
  <p>This problem is fully reproducible on any fresh install, so I guess it must be common. What's the solution?</p>