/usr/share/fusiondirectory/plugins/ is in fusiondirectory-plugin-apache2 1.0.8.8-3ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/fusiondirectory/plugins/admin/
/usr/share/fusiondirectory/plugins/admin/systems/
/usr/share/fusiondirectory/plugins/admin/systems/services/
/usr/share/fusiondirectory/plugins/admin/systems/services/apache2/
/usr/share/fusiondirectory/plugins/admin/systems/services/apache2/class_serviceApacheVhost.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/apache2/class_serviceApacheVhostEdit.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/apache2/class_serviceApacheVhostManagement.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/apache2/remove.tpl
/usr/share/fusiondirectory/plugins/admin/systems/services/apache2/serviceApacheVhostEdit-filter.tpl
/usr/share/fusiondirectory/plugins/admin/systems/services/apache2/serviceApacheVhostEdit-filter.xml
/usr/share/fusiondirectory/plugins/admin/systems/services/apache2/serviceApacheVhostEdit-list.tpl
/usr/share/fusiondirectory/plugins/admin/systems/services/apache2/serviceApacheVhostEdit-list.xml
/usr/share/fusiondirectory/plugins/admin/systems/services/apache2/serviceApacheVhostEditFooter.tpl
/usr/share/fusiondirectory/plugins/admin/systems/services/apache2/tabs_serviceApacheVhostEdit.inc