/usr/lib/pyshared/python2.7/boost/mpi.so is in libboost-mpi-python1.46.1 1.46.1-7ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/pyshared/python2.7/boost/../../../python2.7/dist-packages/boost/mpi.so