/usr/ is in liboil0.3-doc 0.3.17-2ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/gtk-doc/
/usr/share/gtk-doc/html/
/usr/share/gtk-doc/html/liboil/
/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/index.html
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/usr/share/gtk-doc/html/liboil/style.css
/usr/share/gtk-doc/html/liboil/liboil-liboilinit.html
/usr/share/gtk-doc/html/liboil/liboil-liboilfuncs-math8x8.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/up.png
/usr/share/gtk-doc/html/liboil/liboil.devhelp2
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/usr/share/gtk-doc/html/liboil/liboil-liboilfuncs-copy.html
/usr/share/gtk-doc/html/liboil/liboil-liboiltypes.html
/usr/share/gtk-doc/html/liboil/liboil-liboilimpl-unstable.html
/usr/share/gtk-doc/html/liboil/liboil-liboilrandom.html
/usr/share/gtk-doc/html/liboil/ch02.html
/usr/share/gtk-doc/html/liboil/liboil-liboiltest.html
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/usr/share/gtk-doc/html/liboil/liboil-liboilmacros.html
/usr/share/gtk-doc/html/liboil/liboil.devhelp
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/usr/share/doc-base/
/usr/share/doc-base/liboil
/usr/share/doc/
/usr/share/doc/liboil0.3-doc/
/usr/share/doc/liboil0.3-doc/copyright
/usr/share/doc/liboil0.3-doc/AUTHORS
/usr/share/doc/liboil0.3-doc/NEWS.gz
/usr/share/doc/liboil0.3-doc/README
/usr/share/doc/liboil0.3-doc/changelog.Debian.gz