/usr/share/ is in liboil0.3-doc 0.3.17-2ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/
/usr/share/gtk-doc/html/
/usr/share/gtk-doc/html/liboil/
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/usr/share/doc-base/
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/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