4.4.0-128.154) is not available, but a newer one is (4.4.0-142.168). We redirected you there.
/usr/bin/arm-linux-gnueabihf-gnatname is in gnat-7-arm-linux-gnueabihf 7.3.0-16ubuntu3cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/arm-linux-gnueabihf-gnatname-7