/usr/share/gps/gnatdoc/html/templates/ is in gnat-gps-common 6.1.2016-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gps/gnatdoc/html/templates/documentation.html.tmpl
/usr/share/gps/gnatdoc/html/templates/documentation.js.tmpl
/usr/share/gps/gnatdoc/html/templates/documentation_index.js.tmpl
/usr/share/gps/gnatdoc/html/templates/entities_categories_index.js.tmpl
/usr/share/gps/gnatdoc/html/templates/entities_category.html.tmpl
/usr/share/gps/gnatdoc/html/templates/entities_category.js.tmpl
/usr/share/gps/gnatdoc/html/templates/index.js.tmpl
/usr/share/gps/gnatdoc/html/templates/inheritance_index.js.tmpl
/usr/share/gps/gnatdoc/html/templates/source_file.html.tmpl
/usr/share/gps/gnatdoc/html/templates/source_file.js.tmpl
/usr/share/gps/gnatdoc/html/templates/source_file_index.js.tmpl