Apache/HTTP/MPM/Event

Could not detect the PHP and Apache configuration

because exec is disabled or apachectl is not working as expected.

Please note that

PHP can only be used with the MPM_PREFORK module
PHP-FPM can only be used with the MPM_EVENT module

# a2enmod mpm_event
Considering conflict mpm_worker for mpm_event:
Considering conflict mpm_prefork for mpm_event:
ERROR: Module mpm_prefork is enabled - cannot proceed due to conflicts. It needs to be disabled first!

mpm_event

# a2dismod mpm_event

Module mpm_event disabled. To activate the new configuration, you need to run:

 systemctl restart apache2

# a2enmod mpm_prefork
Considering conflict mpm_event for mpm_prefork:
Considering conflict mpm_worker for mpm_prefork:
Enabling module mpm_prefork.

To activate the new configuration, you need to run:

 systemctl restart apache2

#  a2enmod php7.2
# systemctl restart apache2