/usr/bin/m68k-linux-gnu-gnatprep is in gnat-5-m68k-linux-gnu 5.3.1-14ubuntu2cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/m68k-linux-gnu-gnatprep-5
/usr/bin/m68k-linux-gnu-gnatprep-5