/usr/include/dune/grid/onedgrid/ is in libdune-grid-dev 2.3.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dune/grid/onedgrid/nulliteratorfactory.hh
/usr/include/dune/grid/onedgrid/onedgridentity.hh
/usr/include/dune/grid/onedgrid/onedgridentitypointer.hh
/usr/include/dune/grid/onedgrid/onedgridentityseed.hh
/usr/include/dune/grid/onedgrid/onedgridfactory.hh
/usr/include/dune/grid/onedgrid/onedgridgeometry.hh
/usr/include/dune/grid/onedgrid/onedgridhieriterator.hh
/usr/include/dune/grid/onedgrid/onedgridindexsets.hh
/usr/include/dune/grid/onedgrid/onedgridintersectioniterators.hh
/usr/include/dune/grid/onedgrid/onedgridintersections.hh
/usr/include/dune/grid/onedgrid/onedgridleafiterator.hh
/usr/include/dune/grid/onedgrid/onedgridleveliterator.hh
/usr/include/dune/grid/onedgrid/onedgridlist.hh