/usr/share/dune-grid/grids/gmsh/ is in libdune-grid-dev 2.5.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/dune-grid/grids/gmsh/circle.geo
/usr/share/dune-grid/grids/gmsh/circle1storder.msh
/usr/share/dune-grid/grids/gmsh/circle2ndorder.msh
/usr/share/dune-grid/grids/gmsh/curved2d.geo
/usr/share/dune-grid/grids/gmsh/curved2d.msh
/usr/share/dune-grid/grids/gmsh/hybrid-testgrid-2d.msh
/usr/share/dune-grid/grids/gmsh/hybrid-testgrid-3d.msh
/usr/share/dune-grid/grids/gmsh/oned-testgrid.msh
/usr/share/dune-grid/grids/gmsh/pyramid.geo
/usr/share/dune-grid/grids/gmsh/pyramid.msh
/usr/share/dune-grid/grids/gmsh/pyramid1storder.msh
/usr/share/dune-grid/grids/gmsh/pyramid2ndorder.msh
/usr/share/dune-grid/grids/gmsh/pyramid4.msh
/usr/share/dune-grid/grids/gmsh/sphere.msh
/usr/share/dune-grid/grids/gmsh/telescope.geo
/usr/share/dune-grid/grids/gmsh/telescope.msh
/usr/share/dune-grid/grids/gmsh/telescope1storder.msh
/usr/share/dune-grid/grids/gmsh/telescope2ndorder.msh
/usr/share/dune-grid/grids/gmsh/twotets.geo
/usr/share/dune-grid/grids/gmsh/twotets.msh