/usr/share/man/man1/x86_64-linux-gnux32-gnatchop.1.gz is in gnat-7-x86-64-linux-gnux32 7.3.0-16ubuntu3cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/x86_64-linux-gnux32-gnat-7.1.gz