binutils-s390x-linux-gnu 2.29.90.20180122-1ubuntu1 (s390x binary) in ubuntu bionic

 This package provides GNU assembler, linker and binary utilities
 for the s390x-linux-gnu target, for use in a cross-compilation
 environment.
 .
 You don't need this package unless you plan to cross-compile programs
 for s390x-linux-gnu.