/usr/bin/mpicc.mpich-mpd is in libmpich-mpd1.0-dev 1.2.7-10ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../lib/mpich-mpd/bin/mpicc
/usr/bin/../lib/mpich-mpd/bin/mpicc