title: php7.4-fpm fails to start - update PHP 7.3 to PHP 7.4 on VULTR Ubuntu 18.04 with nginx
body: <p>I just tried to update the PHP Version of the nginx server and I get this message, when I enter <code>systemctl status php7.4-fpm.service</code></p>
  <pre><code>    php7.4-fpm.service - The PHP 7.4 FastCGI Process Manager
     Loaded: loaded (/lib/systemd/system/php7.4-fpm.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Mon 2020-12-14 20:11:31 UTC; 4min 50s ago
       Docs: man:php-fpm7.4(8)
    Process: 9196 ExecStopPost=/usr/lib/php/php-fpm-socket-helper remove /run/php/php-fpm.sock /etc/php/7.4/fpm/pool.d/www.conf 74 (code=exited, status=0/SUCCESS)
    Process: 9178 ExecStart=/usr/sbin/php-fpm7.4 --nodaemonize --fpm-config /etc/php/7.4/fpm/php-fpm.conf (code=exited, status=78)
   Main PID: 9178 (code=exited, status=78)
  
  Dec 14 20:11:31 vultr.guest systemd[1]: Starting The PHP 7.4 FastCGI Process Manager...
  Dec 14 20:11:31 vultr.guest php-fpm7.4[9178]: [14-Dec-2020 20:11:31] ERROR: unable to bind listening socket for address '127.0.0.1:9000': Address already in use (98)
  Dec 14 20:11:31 vultr.guest php-fpm7.4[9178]: [14-Dec-2020 20:11:31] ERROR: FPM initialization failed
  Dec 14 20:11:31 vultr.guest systemd[1]: php7.4-fpm.service: Main process exited, code=exited, status=78/n/a
  Dec 14 20:11:31 vultr.guest systemd[1]: php7.4-fpm.service: Failed with result 'exit-code'.
  Dec 14 20:11:31 vultr.guest systemd[1]: Failed to start The PHP 7.4 FastCGI Process Manager.
  </code></pre>
  <p>Also if I check for the Version with <code>php -v</code> I get back the Version <code>7.4.13</code></p>
  <p>However, if upload a test.php File with just <code>&lt;?php phpinfo();?&gt;</code> in it, the Server tells me that I still run on <code>PHP Version 7.3.22-1+ubuntu18.04.1+deb.sury.org+1</code></p>
  <p>Already tried to change the standard PHP version with <code> sudo update-alternatives --set php /usr/bin/php7.4</code></p>
  <p>Thanks for your help</p>