/usr/share/doc/gfortran-multilib-powerpc-linux-gnu is in gfortran-multilib-powerpc-linux-gnu 4:7.3.0-3ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/cpp-powerpc-linux-gnu
/usr/share/doc/cpp-powerpc-linux-gnu