xserver-xorg-core 2:1.18.3-1ubuntu2.3 (amd64 binary) in ubuntu xenial

 The Xorg X server is an X server for several architectures and operating
 systems, which is derived from the XFree86 4.x series of X servers.
 .
 The Xorg server supports most modern graphics hardware from most vendors,
 and supersedes all XFree86 X servers.
 .
 More information about X.Org can be found at:
 <URL:http://www.X.org>
 .
 This package is built from the X.org xserver module.