/usr/bin/aarch64-linux-gnu-gnatclean is in gnat-5-aarch64-linux-gnu 5.3.1-14ubuntu2cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/aarch64-linux-gnu-gnatclean-5
/usr/bin/aarch64-linux-gnu-gnatclean-5