title: Could not find a usable 'nginx' binary. Ensure nginx exists, the binary is executable
body: <p>I'm trying to install certbot on my digital ocean droplet. I'm using ubuntu 20.04 and following instructions from <a href="https://certbot.eff.org/lets-encrypt/ubuntufocal-nginx" rel="nofollow noreferrer">https://certbot.eff.org/lets-encrypt/ubuntufocal-nginx</a>.</p>
  <p>The error occurs when I run <code>sudo certbot --nginx</code>. The error I get is:</p>
  <pre><code>The nginx plugin is not working; there may be problems with your existing configuration.
  The error was: NoInstallationError(&quot;Could not find a usable 'nginx' binary. 
  Ensure nginx exists, the binary is executable, and your PATH is set correctly.&quot;)
  </code></pre>
  <p>This is my first time using digital ocean and such so please explain the solution. Thank you.</p>