/usr/include/gnome-disk-utility/ is in libgdu-gtk-dev 3.0.2-2ubuntu7.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gnome-disk-utility/gdu-gtk/
/usr/include/gnome-disk-utility/gdu-gtk/gdu-add-component-linux-md-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-add-pv-linux-lvm2-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-ata-smart-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-button-element.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-button-table.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-confirmation-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-connect-to-server-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-create-linux-lvm2-volume-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-create-linux-md-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-create-partition-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-details-element.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-details-table.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-disk-selection-widget.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-drive-benchmark-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-edit-linux-lvm2-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-edit-linux-md-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-edit-name-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-edit-partition-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-error-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-format-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-gtk-enums.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-gtk-enumtypes.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-gtk-types.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-gtk.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-partition-dialog.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-pool-tree-model.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-pool-tree-view.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-size-widget.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-time-label.h
/usr/include/gnome-disk-utility/gdu-gtk/gdu-volume-grid.h