/usr/share/man/man1/x86_64-linux-gnu-cpp-4.8.1.gz is in cpp-4.8 4.8.4-2ubuntu1~14.04.4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/cpp-4.8.1.gz
/usr/share/man/man1/cpp-4.8.1.gz