/usr/ is in libclutter-gtk-1.0-doc 1.4.4-3ubuntu2.
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/clutter-gtk-1.0/
/usr/share/gtk-doc/html/clutter-gtk-1.0/clutter-gtk-1.0-Utility-Functions.html
/usr/share/gtk-doc/html/clutter-gtk-1.0/GtkClutterEmbed.html
/usr/share/gtk-doc/html/clutter-gtk-1.0/GtkClutterWindow.html
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/usr/share/gtk-doc/html/clutter-gtk-1.0/style.css
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/usr/share/gtk-doc/html/clutter-gtk-1.0/GtkClutterActor.html
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/usr/share/doc/libclutter-gtk-1.0-doc/copyright
/usr/share/doc/libclutter-gtk-1.0-doc/README
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