/usr/share/man/man1/arm-linux-gnueabihf-gnatclean-6.1.gz is in gnat-6-arm-linux-gnueabihf 6.4.0-17ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/arm-linux-gnueabihf-gnat-6.1.gz