/usr/share/gimp/2.0/menus/ is in gimp-data 2.6.12-1ubuntu1.4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gimp/2.0/menus/brush-editor-menu.xml
/usr/share/gimp/2.0/menus/brushes-menu.xml
/usr/share/gimp/2.0/menus/buffers-menu.xml
/usr/share/gimp/2.0/menus/channels-menu.xml
/usr/share/gimp/2.0/menus/colormap-menu.xml
/usr/share/gimp/2.0/menus/cursor-info-menu.xml
/usr/share/gimp/2.0/menus/dockable-menu.xml
/usr/share/gimp/2.0/menus/documents-menu.xml
/usr/share/gimp/2.0/menus/error-console-menu.xml
/usr/share/gimp/2.0/menus/fonts-menu.xml
/usr/share/gimp/2.0/menus/gradient-editor-menu.xml
/usr/share/gimp/2.0/menus/gradients-menu.xml
/usr/share/gimp/2.0/menus/image-menu.xml
/usr/share/gimp/2.0/menus/images-menu.xml
/usr/share/gimp/2.0/menus/layers-menu.xml
/usr/share/gimp/2.0/menus/palette-editor-menu.xml
/usr/share/gimp/2.0/menus/palettes-menu.xml
/usr/share/gimp/2.0/menus/patterns-menu.xml
/usr/share/gimp/2.0/menus/quick-mask-menu.xml
/usr/share/gimp/2.0/menus/sample-points-menu.xml
/usr/share/gimp/2.0/menus/selection-menu.xml
/usr/share/gimp/2.0/menus/templates-menu.xml
/usr/share/gimp/2.0/menus/text-editor-toolbar.xml
/usr/share/gimp/2.0/menus/tool-options-menu.xml
/usr/share/gimp/2.0/menus/tools-menu.xml
/usr/share/gimp/2.0/menus/undo-menu.xml
/usr/share/gimp/2.0/menus/vectors-menu.xml