/etc/apache2/mods-available/auth_kerb.load is in libapache2-mod-auth-kerb 5.4-2.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | LoadModule auth_kerb_module /usr/lib/apache2/modules/mod_auth_kerb.so
|