/usr/bin/arm-linux-gnueabi-gnatgcc is in gnat-7-arm-linux-gnueabi 7.3.0-16ubuntu3cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/arm-linux-gnueabi-gcc-7
/usr/bin/arm-linux-gnueabi-gcc-7