/usr/include/deal.II/meshworker/ is in libdeal.ii-dev 8.4.2-2+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/deal.II/meshworker/assembler.h
/usr/include/deal.II/meshworker/dof_info.h
/usr/include/deal.II/meshworker/dof_info.templates.h
/usr/include/deal.II/meshworker/functional.h
/usr/include/deal.II/meshworker/integration_info.h
/usr/include/deal.II/meshworker/integration_info.templates.h
/usr/include/deal.II/meshworker/local_integrator.h
/usr/include/deal.II/meshworker/local_results.h
/usr/include/deal.II/meshworker/loop.h
/usr/include/deal.II/meshworker/output.h
/usr/include/deal.II/meshworker/simple.h
/usr/include/deal.II/meshworker/vector_selector.h
/usr/include/deal.II/meshworker/vector_selector.templates.h