/usr/share/man/man1/clog2alog.mpich-shmem.1.gz is in mpich-shmem-bin 1.2.7-10ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/../../../lib/mpich-shmem/man/man1/clog2alog.1.gz