/usr/bin/z80-unknown-coff-ld.bfd is in binutils-z80 2.23.52.20130612-1ubuntu1+3.
This file is owned by root:root, with mode 0o755.
It is a symlink to /usr/bin/./usr/bin/z80-unknown-coff-ld
/usr/bin/./usr/bin/z80-unknown-coff-ld