Upgrade from Ubuntu 19.04 to 20.04 broke my Nextcloud

Support intro

After upgrading from Ubuntu 19.04 to 20.04 my Nextcloud 18 is broken. I upgraded with do-release-upgrade and my ubuntu 19.04 was up2date. I searched a lot but cannot find a solution.

Nextcloud version: 18.0.0.4
Operating system and version: Ubtuntu 20.04
Apache or nginx version :Apache 2.4

The issue: When entering website: Internal server error

output of Nextcloud log:

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The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'instanceid' => 'f1',
  'passwordsalt' => 'xxxz',
  'secret' => 'xxx',
  'trusted_domains' => 
  array (
    0 => 'localhost',
    1 => 'xxxx',
    2 => 'xxxx',
  ),
  'datadirectory' => '/var/www/html/nextcloud/data',
  'overwrite.cli.url' => 'https://xxxx',
  'htaccess.RewriteBase' => '/',
  'dbtype' => 'mysql',
  'version' => '18.0.4.2',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nxxxx',
  'dbpassword' => 'xxxx',
  'installed' => true,
  'updater.release.channel' => 'stable',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => '2',
  'logfile' => '/var/www/html/nextcloud/data/nextcloud.log',
  'logdateformat' => 'F d, Y H:i:s',
  'logtimezone' => 'Europe/Amsterdam',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'filelocking.enabled' => 'false',
  'redis' => 
  array (
    'host' => '/var/run/redis/redis-server.sock',
    'port' => 0,
    'timeout' => 0.0,
  ),
  'mail_smtpmode' => 'smtp',
  'mail_smtpsecure' => 'tls',
  'mail_sendmailmode' => 'smtp',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_smtpauth' => 1,
  'mail_from_address' => 'xx',
  'mail_domain' => 'xxxx',
  'mail_smtphost' => 'xxxx',
  'mail_smtpport' => 'xxx',
  'mail_smtpname' => 'xxx',
  'mail_smtppassword' => 'xxx',
  'app_install_overwrite' => 
  array (
    0 => 'hsts',
    1 => 'limit_login_to_ip',
  ),
  'updater.secret' => 'xxxx',
);

Have you searched this forum before posting?

No I did not, maybe because that is a relative new topic I overlooked it. Going to follow those steps. Thank you.