/usr/include/dune/common/parallel/ is in libdune-common-dev 2.3.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dune/common/parallel/collectivecommunication.hh
/usr/include/dune/common/parallel/communicator.hh
/usr/include/dune/common/parallel/indexset.hh
/usr/include/dune/common/parallel/indicessyncer.hh
/usr/include/dune/common/parallel/interface.hh
/usr/include/dune/common/parallel/localindex.hh
/usr/include/dune/common/parallel/mpicollectivecommunication.hh
/usr/include/dune/common/parallel/mpiguard.hh
/usr/include/dune/common/parallel/mpihelper.hh
/usr/include/dune/common/parallel/mpitraits.hh
/usr/include/dune/common/parallel/plocalindex.hh
/usr/include/dune/common/parallel/remoteindices.hh
/usr/include/dune/common/parallel/selection.hh
/usr/include/dune/common/parallel/variablesizecommunicator.hh