4.15.0-34.37) is not available, but a newer one is (4.15.0-46.49). We redirected you there.
/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