/usr/lib/libmpi_usempif08.so is in libopenmpi-dev 1.10.2-8ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libmpi_usempif08.so.11.1.0
/usr/lib/libmpi_usempif08.so.11.1.0