/usr/lib/x86_64-linux-gnu/libboost_mpi_python-py34.so is in libboost-mpi-python1.54-dev 1.54.0-4ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libboost_mpi_python-py34.so.1.54.0