/usr/bin/arm-linux-gnueabihf-gnathtml is in gnat-5-arm-linux-gnueabihf 5.5.0-12ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/arm-linux-gnueabihf-gnathtml-5
/usr/bin/arm-linux-gnueabihf-gnathtml-5