/usr/ is in libcanberra-gtk3-module 0.30-0ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/gnome-settings-daemon-3.0/
/usr/lib/gnome-settings-daemon-3.0/gtk-modules/
/usr/lib/gnome-settings-daemon-3.0/gtk-modules/canberra-gtk3-module.desktop
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/gtk-3.0/
/usr/lib/x86_64-linux-gnu/gtk-3.0/modules/
/usr/lib/x86_64-linux-gnu/gtk-3.0/modules/libcanberra-gtk3-module.so
/usr/lib/unity-settings-daemon-1.0/
/usr/lib/unity-settings-daemon-1.0/gtk-modules/
/usr/lib/unity-settings-daemon-1.0/gtk-modules/canberra-gtk3-module.desktop
/usr/share/
/usr/share/doc/
/usr/share/doc/libcanberra-gtk3-module/
/usr/share/doc/libcanberra-gtk3-module/copyright
/usr/lib/x86_64-linux-gnu/gtk-3.0/modules/libcanberra-gtk-module.so
/usr/share/doc/libcanberra-gtk3-module/README.gz
/usr/share/doc/libcanberra-gtk3-module/changelog.Debian.gz