libnbd0 1.2.2-1ubuntu2 (s390x binary) in ubuntu focal

 NBD — Network Block Device — is a protocol for accessing Block
 Devices (hard disks and disk-like things) over a Network.
 .
 This is the NBD client library in userspace, a simple library for
 writing NBD clients.
 .
 The key features are:
 .
  * Synchronous and asynchronous APIs, both for ease of use and for
    writing non-blocking, multithreaded clients.
 .
  * High performance.
 .
  * Minimal dependencies for the basic library.
 .
  * Well-documented, stable API.
 .
  * Bindings in several programming languages.
 .
 This package contains the shared library.