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[Anders Kaseorg <andersk@xxxxxxx>]

This isn’t specific to unity-window-decorator.  If you go to ccsm →
Effects → Window Decoration and change the command to /usr/bin/gtk-
window-decorator, that fails in the same way.  ~/.xsession-errors has
the line

(gtk-window-decorator:19510): Gtk-WARNING **: cannot open display: :0.0

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https://bugs.launchpad.net/bugs/730495

Title:
  unity-window-decorator doesn't start on secondary X session