/usr/bin/z80-unknown-coff-ld is in binutils-z80 2.24.51.20140425-0ubuntu2+4.
This file is owned by root:root, with mode 0o755.
It is a symlink to /usr/bin/./usr/bin/z80-unknown-coff-ld.bfd
/usr/bin/./usr/bin/z80-unknown-coff-ld.bfd