title: AttributeError: module 'os' has no attribute 'PathLike' after command virutalenv mydir on ubuntu 16.04
body: <p>Virtualenv does not work.</p>
  <pre><code>virtualenv mydir
  AttributeError: module 'os' has no attribute 'PathLike'
  
  
  python3-pip:
    Installed: 8.1.1-2ubuntu0.6
  
  python3-dev:
    Installed: 3.5.1-3
  
  lsb_release -a:
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 16.04.7 LTS
  Release:    16.04
  Codename:   xenial
  </code></pre>
  <p>Thanks in advance!</p>