libnx-x11-6 2:3.5.99.14-2 (s390x binary) in ubuntu bionic

 NX is a software suite which implements very efficient
 compression of the X11 protocol. This increases performance when
 using X applications over a network, especially a slow one.
 .
 This package provides the libNX_X11 library (a libX11 drop-in
 replacement used by nxagent).