nbdkit 1.16.2-1ubuntu2 (s390x binary) in ubuntu focal

 NBD is a protocol for accessing block Devices (hard disks and
 disk-like things) over a network. nbdkit is a multithreaded NBD
 server with a well-documented, simple plugin API with a stable ABI
 guarantee that allows for easy creation of "unconventional" block
 devices.
 .
 This package provides the nbdkit binary and a the file, gzip, and xz,
 plugins.