/usr/share/man/man1/powerpc-linux-gnuspe-gnatclean.1.gz is in gnat-8-powerpc-linux-gnuspe 8-20180414-1ubuntu2cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/powerpc-linux-gnuspe-gnat-8.1.gz