/usr/ is in guile-gnome2-gnome-ui 2.16.1-6ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/guile-gnome2-gnome-ui/
/usr/share/
/usr/share/doc/
/usr/share/doc/guile-gnome2-gnome-ui/copyright
/usr/share/guile-gnome-2/
/usr/share/guile-gnome-2/gnome/
/usr/share/guile-gnome-2/gnome/gw/
/usr/share/guile-gnome-2/gnome/gw/libgnomeui.scm
/usr/share/guile-gnome-2/gnome/gnome-ui.scm
/usr/lib/
/usr/lib/guile-gnome-2/
/usr/lib/guile-gnome-2/libgw-guile-gnome-libgnomeui.la
/usr/lib/guile-gnome-2/libgw-guile-gnome-libgnomeui.so.0.0.0
/usr/share/doc/guile-gnome2-gnome-ui/README
/usr/share/doc/guile-gnome2-gnome-ui/AUTHORS
/usr/share/doc/guile-gnome2-gnome-ui/NEWS.gz
/usr/share/doc/guile-gnome2-gnome-ui/changelog.Debian.gz
/usr/lib/guile-gnome-2/libgw-guile-gnome-libgnomeui.so
/usr/lib/guile-gnome-2/libgw-guile-gnome-libgnomeui.so.0