/usr/include/deal.II/fe/ is in libdeal.ii-dev 6.3.1-1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/deal.II/fe/fe.h
/usr/include/deal.II/fe/fe_abf.h
/usr/include/deal.II/fe/fe_base.h
/usr/include/deal.II/fe/fe_dgp.h
/usr/include/deal.II/fe/fe_dgp_monomial.h
/usr/include/deal.II/fe/fe_dgp_nonparametric.h
/usr/include/deal.II/fe/fe_dgq.h
/usr/include/deal.II/fe/fe_face.h
/usr/include/deal.II/fe/fe_nedelec.h
/usr/include/deal.II/fe/fe_nothing.h
/usr/include/deal.II/fe/fe_poly.h
/usr/include/deal.II/fe/fe_poly.templates.h
/usr/include/deal.II/fe/fe_poly_face.h
/usr/include/deal.II/fe/fe_poly_face.templates.h
/usr/include/deal.II/fe/fe_poly_tensor.h
/usr/include/deal.II/fe/fe_q.h
/usr/include/deal.II/fe/fe_q_hierarchical.h
/usr/include/deal.II/fe/fe_raviart_thomas.h
/usr/include/deal.II/fe/fe_system.h
/usr/include/deal.II/fe/fe_tools.h
/usr/include/deal.II/fe/fe_update_flags.h
/usr/include/deal.II/fe/fe_values.h
/usr/include/deal.II/fe/mapping.h
/usr/include/deal.II/fe/mapping_c1.h
/usr/include/deal.II/fe/mapping_cartesian.h
/usr/include/deal.II/fe/mapping_q.h
/usr/include/deal.II/fe/mapping_q1.h
/usr/include/deal.II/fe/mapping_q1_eulerian.h
/usr/include/deal.II/fe/mapping_q_eulerian.h