xauth 1:1.0.2-0ubuntu1 (i386 binary) in ubuntu gutsy

 xauth is a small utility to read and manipulate Xauthority files, which
 are used by servers and clients alike to control authentication and access
 to X sessions.
 .
 More information about X.Org can be found at:
 <URL:http://xorg.freedesktop.org>
 <URL:http://lists.freedesktop.org/mailman/listinfo/xorg>
 .
 This module can be found as 'app/xauth' at
 http://xorg.freedesktop.org/releases/individual/