/usr/share/gtk-doc/html/ is in liboil0.3-doc 0.3.17-2ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/liboil/
/usr/share/gtk-doc/html/liboil/ch01.html
/usr/share/gtk-doc/html/liboil/ch02.html
/usr/share/gtk-doc/html/liboil/home.png
/usr/share/gtk-doc/html/liboil/index.html
/usr/share/gtk-doc/html/liboil/index.sgml
/usr/share/gtk-doc/html/liboil/left.png
/usr/share/gtk-doc/html/liboil/liboil-liboilclass-unstable.html
/usr/share/gtk-doc/html/liboil/liboil-liboilcpu.html
/usr/share/gtk-doc/html/liboil/liboil-liboildebug.html
/usr/share/gtk-doc/html/liboil/liboil-liboilfuncs-conv.html
/usr/share/gtk-doc/html/liboil/liboil-liboilfuncs-copy.html
/usr/share/gtk-doc/html/liboil/liboil-liboilfuncs-dct.html
/usr/share/gtk-doc/html/liboil/liboil-liboilfuncs-doc.html
/usr/share/gtk-doc/html/liboil/liboil-liboilfuncs-math.html
/usr/share/gtk-doc/html/liboil/liboil-liboilfuncs-math8x8.html
/usr/share/gtk-doc/html/liboil/liboil-liboilfuncs-pixel.html
/usr/share/gtk-doc/html/liboil/liboil-liboilimpl-unstable.html
/usr/share/gtk-doc/html/liboil/liboil-liboilinit-unstable.html
/usr/share/gtk-doc/html/liboil/liboil-liboilinit.html
/usr/share/gtk-doc/html/liboil/liboil-liboiljunk.html
/usr/share/gtk-doc/html/liboil/liboil-liboilmacros.html
/usr/share/gtk-doc/html/liboil/liboil-liboilparameter.html
/usr/share/gtk-doc/html/liboil/liboil-liboilprofile.html
/usr/share/gtk-doc/html/liboil/liboil-liboilprototype.html
/usr/share/gtk-doc/html/liboil/liboil-liboilrandom.html
/usr/share/gtk-doc/html/liboil/liboil-liboiltest.html
/usr/share/gtk-doc/html/liboil/liboil-liboiltypes.html
/usr/share/gtk-doc/html/liboil/liboil.devhelp
/usr/share/gtk-doc/html/liboil/liboil.devhelp2
/usr/share/gtk-doc/html/liboil/right.png
/usr/share/gtk-doc/html/liboil/style.css
/usr/share/gtk-doc/html/liboil/up.png