/usr/ is in unity-gtk-module-common 0.0.0+18.04.20171202-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/systemd/
/usr/lib/systemd/user/
/usr/lib/systemd/user/unity-gtk-module.service
/usr/lib/systemd/user/unity-session.target.wants/
/usr/share/
/usr/share/doc/
/usr/share/doc/unity-gtk-module-common/
/usr/share/doc/unity-gtk-module-common/changelog.Debian.gz
/usr/share/doc/unity-gtk-module-common/copyright
/usr/share/glib-2.0/
/usr/share/glib-2.0/schemas/
/usr/share/glib-2.0/schemas/com.canonical.unity-gtk-module.gschema.xml
/usr/share/upstart/
/usr/share/upstart/sessions/
/usr/share/upstart/sessions/unity-gtk-module.conf
/usr/lib/systemd/user/unity-session.target.wants/unity-gtk-module.service