/usr/share/gtk-doc/html/ is in libhkl-doc 4.0.3-4ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/hkl-4/
/usr/share/gtk-doc/html/hkl-4/api-index-full.html
/usr/share/gtk-doc/html/hkl-4/ch01.html
/usr/share/gtk-doc/html/hkl-4/hkl-4.devhelp
/usr/share/gtk-doc/html/hkl-4/hkl-4.devhelp2
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-axis.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-detector-factory.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-detector.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-error.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-geometry-factory.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-geometry.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-interval.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-lattice.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-list.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-macros.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-matrix.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-parameter.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis-auto.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis-common-eulerians.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis-common-hkl.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis-common-psi.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis-common-q.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis-common.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis-e4cv.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis-e6c.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis-factory.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis-k4cv.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis-k6c.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis-zaxis.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-pseudoaxis.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-quaternion.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-sample.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-source.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-unit.html
/usr/share/gtk-doc/html/hkl-4/hkl-hkl-vector.html
/usr/share/gtk-doc/html/hkl-4/home.png
/usr/share/gtk-doc/html/hkl-4/index.html
/usr/share/gtk-doc/html/hkl-4/index.sgml
/usr/share/gtk-doc/html/hkl-4/left.png
/usr/share/gtk-doc/html/hkl-4/object-tree.html
/usr/share/gtk-doc/html/hkl-4/right.png
/usr/share/gtk-doc/html/hkl-4/style.css
/usr/share/gtk-doc/html/hkl-4/up.png