/usr/lib/x86_64-linux-gnu/libfmpich.so is in libmpich-dev 3.0.4-6ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libfmpich.so.10.0.4
/usr/lib/x86_64-linux-gnu/libfmpich.so.10.0.4