/usr/share/doc/gccgo-multilib-s390x-linux-gnu is in gccgo-multilib-s390x-linux-gnu 4:5.3.1-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/cpp-s390x-linux-gnu
/usr/share/doc/cpp-s390x-linux-gnu