/etc/apache2/conf-available/simplesamlphp.conf is in simplesamlphp 1.9.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /etc/apache2/conf-available/../../simplesamlphp/apache.conf
/etc/apache2/conf-available/../../simplesamlphp/apache.conf