xserver-xorg-core-lts-trusty-dbg 2:1.15.1-0ubuntu2~precise5 (i386 binary) in ubuntu precise

 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.
 .
 This package provides debugging symbols for the Xorg X server and associated
 modules.