title: Trying to install python3.6 virtualenv on Ubuntu 20.04
body: <p>I've recently upgraded my PC from Ubuntu 18.04 to Ubuntu20.04 and <code>virtualenv</code> stopped working for Pythn3.6.  I discovered Python3.6 was no longer installed but I had done some stuff prior to that.</p>
  <p>When I run <code>virtualenv venv -p python3.6</code> I now get</p>
  <blockquote>
  <p>bash: /usr/local/bin/virtualenv: No such file or directory</p>
  </blockquote>
  <p>But if I try to install <code>virtualenv</code> it is already installed.</p>
  <pre><code>henry@henry-DT2216:~$ sudo apt-get install virtualenv
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  virtualenv is already the newest version (20.0.17-1ubuntu0.3).
  0 to upgrade, 0 to newly install, 0 to remove and 13 not to upgrade.
  </code></pre>
  <p>I have tried purging and reinstalling, but I am now stuck.  Please help</p>