/usr/share/doc/cpp-powerpc-linux-gnuspe/README.Bugs is in gcc-powerpc-linux-gnuspe 4:7.3.0-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/cpp-powerpc-linux-gnuspe/../gcc-7-powerpc-linux-gnuspe-base/README.Bugs