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