/usr/include/dune/grid/geometrygrid/ is in libdune-grid-dev 2.3.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dune/grid/geometrygrid/backuprestore.hh
/usr/include/dune/grid/geometrygrid/cachedcoordfunction.hh
/usr/include/dune/grid/geometrygrid/capabilities.hh
/usr/include/dune/grid/geometrygrid/coordfunction.hh
/usr/include/dune/grid/geometrygrid/coordfunctioncaller.hh
/usr/include/dune/grid/geometrygrid/cornerstorage.hh
/usr/include/dune/grid/geometrygrid/datahandle.hh
/usr/include/dune/grid/geometrygrid/declaration.hh
/usr/include/dune/grid/geometrygrid/entity.hh
/usr/include/dune/grid/geometrygrid/entitypointer.hh
/usr/include/dune/grid/geometrygrid/entityseed.hh
/usr/include/dune/grid/geometrygrid/geometry.hh
/usr/include/dune/grid/geometrygrid/grid.hh
/usr/include/dune/grid/geometrygrid/gridfamily.hh
/usr/include/dune/grid/geometrygrid/gridview.hh
/usr/include/dune/grid/geometrygrid/hostcorners.hh
/usr/include/dune/grid/geometrygrid/identity.hh
/usr/include/dune/grid/geometrygrid/idset.hh
/usr/include/dune/grid/geometrygrid/indexsets.hh
/usr/include/dune/grid/geometrygrid/intersection.hh
/usr/include/dune/grid/geometrygrid/intersectioniterator.hh
/usr/include/dune/grid/geometrygrid/iterator.hh
/usr/include/dune/grid/geometrygrid/persistentcontainer.hh