The problem may be related to Ubuntu (experienced on 10.4) apparently
executing the commands

xhost +si:localuser:`id -un`
xhost +si:localuser:root
xhost +si:localuser:gdm

or does something equivalent when you log in. Just type "xhost" to see
the list of non-xauth authorizations currently enabled for your X11
server. The first of the above lines is in

  /etc/X11/Xsession.d/60x11-common_localhost

The exmh background daemon considers the presence of any of these to be
bad and therefore refuses to work. Executing the above three lines with
+ changed to - is a workaround, but ultimately exmh-bg (or a library it
uses) probably needs patching to tolerate this practice.

See also "man xhost".

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https://bugs.launchpad.net/bugs/371181

Title:
  xauth authentication not working

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