/etc/apache2/mods-available/passenger.conf is in libapache2-mod-passenger 4.0.37-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | <IfModule mod_passenger.c>
PassengerRoot /usr/lib/ruby/vendor_ruby/phusion_passenger/locations.ini
PassengerDefaultRuby /usr/bin/ruby
</IfModule>
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