/usr/ is in libnm-gtk-dev 1.8.10-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/libnm-gtk/
/usr/include/libnm-gtk/nm-cert-chooser.h
/usr/include/libnm-gtk/nm-mobile-providers.h
/usr/include/libnm-gtk/nm-mobile-wizard.h
/usr/include/libnm-gtk/nm-ui-utils.h
/usr/include/libnm-gtk/nm-vpn-password-dialog.h
/usr/include/libnm-gtk/nm-wifi-dialog.h
/usr/include/libnm-gtk/nm-wireless-dialog.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libnm-gtk.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libnm-gtk-dev/
/usr/share/doc/libnm-gtk-dev/copyright
/usr/share/gir-1.0/
/usr/share/gir-1.0/NMGtk-1.0.gir
/usr/lib/x86_64-linux-gnu/libnm-gtk.so
/usr/share/doc/libnm-gtk-dev/changelog.Debian.gz