Internal server failure on calling serverinfo

Nextcloud version: 23.0.0
Operating system and version: Ubuntu 20.04
Apache or nginx version: 2.4.41
PHP version : 8.0

The issue you are facing:

When accessing
index.php/settings/admin/serverinfo
on my NextCloud-instance, the server answers with an internal server failure.
Let me highlight, that everything else works perfectly fine!

Is this the first time you’ve seen this error? N

Steps to replicate it:

  1. simply call index.php/settings/admin/serverinfo on the NextCloud-instance or click in the last entry in the Maintenance-section of the menu. I hope the translation is properly as I am using the german-version of NextCloud. However, I think the URL provided should make clear which function is affected

The output of your Nextcloud log in Admin > Logging:

Exception: Call to undefined function OCA\ServerInfo\OperatingSystems\shell_exec() in file '/var/www/clients/client112/web355/web/cloud/apps/serverinfo/lib/OperatingSystems/DefaultOs.php' line 229

    /var/www/clients/client112/web355/web/cloud/lib/private/AppFramework/App.php - line 157:

    OC\AppFramework\Http\Dispatcher->dispatch()

    /var/www/clients/client112/web355/web/cloud/lib/private/Route/Router.php - line 302:

    OC\AppFramework\App::main()

    /var/www/clients/client112/web355/web/cloud/lib/base.php - line 1006:

    OC\Route\Router->match()

    /var/www/clients/client112/web355/web/cloud/index.php - line 36:

    OC::handleRequest()

Verursacht durch Error: Call to undefined function OCA\ServerInfo\OperatingSystems\shell_exec()

    /var/www/clients/client112/web355/web/cloud/apps/serverinfo/lib/OperatingSystems/DefaultOs.php - line 188:

    OCA\ServerInfo\OperatingSystems\DefaultOs->executeCommand()

    /var/www/clients/client112/web355/web/cloud/apps/serverinfo/lib/Os.php - line 104:

    OCA\ServerInfo\OperatingSystems\DefaultOs->getDiskInfo()

    /var/www/clients/client112/web355/web/cloud/apps/serverinfo/lib/Settings/AdminSettings.php - line 112:

    OCA\ServerInfo\Os->getDiskInfo()

    /var/www/clients/client112/web355/web/cloud/apps/settings/lib/Controller/CommonSettingsTrait.php - line 129:

    OCA\ServerInfo\Settings\AdminSettings->getForm()

    /var/www/clients/client112/web355/web/cloud/apps/settings/lib/Controller/AdminSettingsController.php - line 83:

    OCA\Settings\Controller\AdminSettingsController->formatSettings()

    /var/www/clients/client112/web355/web/cloud/apps/settings/lib/Controller/CommonSettingsTrait.php - line 140:

    OCA\Settings\Controller\AdminSettingsController->getSettings()

    /var/www/clients/client112/web355/web/cloud/apps/settings/lib/Controller/AdminSettingsController.php - line 68:

    OCA\Settings\Controller\AdminSettingsController->getIndexResponse()

    /var/www/clients/client112/web355/web/cloud/lib/private/AppFramework/Http/Dispatcher.php - line 217:

    OCA\Settings\Controller\AdminSettingsController->index()

    /var/www/clients/client112/web355/web/cloud/lib/private/AppFramework/Http/Dispatcher.php - line 126:

    OC\AppFramework\Http\Dispatcher->executeController()

    /var/www/clients/client112/web355/web/cloud/lib/private/AppFramework/App.php - line 157:

    OC\AppFramework\Http\Dispatcher->dispatch()

    /var/www/clients/client112/web355/web/cloud/lib/private/Route/Router.php - line 302:

    OC\AppFramework\App::main()

    /var/www/clients/client112/web355/web/cloud/lib/base.php - line 1006:

    OC\Route\Router->match()

    /var/www/clients/client112/web355/web/cloud/index.php - line 36:

    OC::handleRequest()

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

<?php
$CONFIG = array (
  'instanceid' => *removed*,
  'passwordsalt' => *removed*,
  'secret' => *removed*,
  'trusted_domains' => 
  array (
    0 => *removed*,
    1 => *removed*,
  ),
  'datadirectory' => *removed*,
  'dbtype' => 'mysql',
  'version' => '23.0.0.10',
  'overwrite.cli.url' => *removed*,
  'dbname' => *removed*,
  'dbhost' => *removed*,
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => *removed*,
  'dbpassword' => *removed*,
  'installed' => true,
  'mail_smtpmode' => 'smtp',
  'mail_sendmailmode' => 'smtp',
  'twofactor_enforced' => 'true',
  'twofactor_enforced_groups' => 
  array (
    0 => 'admin',
    1 => *removed*,
  ),
  'twofactor_enforced_excluded_groups' => 
  array (
  ),
  'mail_smtpsecure' => 'tls',
  'mail_from_address' => 'noreply',
  'mail_domain' => *removed*,
  'mail_smtpauth' => 1,
  'mail_smtpauthtype' => 'LOGIN',
  'mail_smtphost' => *removed*,
  'mail_smtpport' => '587',
  'mail_smtpname' => *removed*,
  'mail_smtppassword' => *removed*,
  'app_install_overwrite' => 
  array (
    0 => 'printer',
  ),
);

The output of your Apache/nginx/system log in /var/log/____:
As this solution is hosted by a hoster, I do not have acccess to the logs.

PASTE HERE

In my opinion the error-information out of Admin > Logging clarifies the issue already… there seems to be a call to an undefined function OCA\ServerInfo\OperatingSystems\shell_exec(). Is there maybe a php-library missing? If yes, can you please tell me which one, so that I can contact the hoster of my server to add this library?

Thanks a lot in advance!