/usr/include/deal.II/numerics/ is in libdeal.ii-dev 6.3.1-1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/deal.II/numerics/data_component_interpretation.h
/usr/include/deal.II/numerics/data_out.h
/usr/include/deal.II/numerics/data_out_faces.h
/usr/include/deal.II/numerics/data_out_rotation.h
/usr/include/deal.II/numerics/data_out_stack.h
/usr/include/deal.II/numerics/data_postprocessor.h
/usr/include/deal.II/numerics/derivative_approximation.h
/usr/include/deal.II/numerics/dof_print_solver_step.h
/usr/include/deal.II/numerics/error_estimator.h
/usr/include/deal.II/numerics/fe_field_function.h
/usr/include/deal.II/numerics/fe_field_function.templates.h
/usr/include/deal.II/numerics/histogram.h
/usr/include/deal.II/numerics/matrices.h
/usr/include/deal.II/numerics/mesh_worker.h
/usr/include/deal.II/numerics/mesh_worker_assembler.h
/usr/include/deal.II/numerics/mesh_worker_info.h
/usr/include/deal.II/numerics/mesh_worker_info.templates.h
/usr/include/deal.II/numerics/mesh_worker_loop.h
/usr/include/deal.II/numerics/mesh_worker_output.h
/usr/include/deal.II/numerics/mesh_worker_vector_selector.h
/usr/include/deal.II/numerics/mesh_worker_vector_selector.inst.in
/usr/include/deal.II/numerics/mesh_worker_vector_selector.templates.h
/usr/include/deal.II/numerics/newton.h
/usr/include/deal.II/numerics/newton.templates.h
/usr/include/deal.II/numerics/operator.h
/usr/include/deal.II/numerics/operator.templates.h
/usr/include/deal.II/numerics/point_value_history.h
/usr/include/deal.II/numerics/solution_transfer.h
/usr/include/deal.II/numerics/theta_timestepping.h
/usr/include/deal.II/numerics/theta_timestepping.templates.h
/usr/include/deal.II/numerics/time_dependent.h
/usr/include/deal.II/numerics/timestep_control.h
/usr/include/deal.II/numerics/vectors.h
/usr/include/deal.II/numerics/vectors.templates.h