Installation is running:

Update sources list ...                     [OKAY]
Installation requirements ...               [OKAY]
Sudo ...                                    [OKAY]
Bind9 ...                                   [OKAY]
SSL/TLS ...                                 [OKAY]
PHP ...                                     [OKAY]
Apache web server ...                       [OKAY]
PHP-FPM ...                                 [OKAY]
MariaDB ...                                 [OKAY]
KeyHelp ...                                 [OKAY]
Backup tools ...                            [OKAY]
Firewall ...                                [OKAY]
SSH ...                                     [OKAY]
ProFTPD ...                                 [OKAY]
Postfix ...                                 [OKAY]
Dovecot ...                                 [OKAY]
OpenDKIM ...                                [OKAY]
Email protection ...                        [OKAY]
AWStats ...                                 [OKAY]
Fail2ban ...                                [OKAY]
Logrotate ...                               [OKAY]
PhpMyAdmin 5.1.1 ...                        [OKAY]
Adminer 4.8.1 ...                           [OKAY]
Roundcube 1.5.1 Multilanguage ...           [OKAY]
Rainloop 1.16.0 (Community Edition) ...     [OKAY]
Quota ...                                   [ERROR]
Apparmor ...                                [OKAY]
7-zip ...                                   [OKAY]
Hide LTS notice ...                         [OKAY]
Update message of the day ...               [OKAY]
Nano ...                                    [OKAY]
Curl ...                                    [OKAY]
Cron daemon ...                             [OKAY]

Errors occurred during installation!

For more information, see the log file:
/var/log/keyhelp/install.log

If you need help, please visit our multilingual support community:
https://community.keyhelp.de

You will find your login information on your server in the file:
/root/keyhelp_login_data_2022-01-14_20-03-41