Public bug reported:

If the GConf key /apps/metacity/general/compositing_manager is set to
true, Compiz cannot start. This makes it impossible to use gnome-
appearance-properties to turn on the visual effects, even on a system
that can use these visual effects. When selecting anything other than
"None" in the Visual Effects tab of gnome-appearance-properties this key
should first be set to false to actually enable the effects.

The error message when the process fails is 
/usr/bin/compiz.real (core) - Error: Could not acquire compositing manager 
selection on screen 0 display ":0.0"
/usr/bin/compiz.real (core) - Fatal: No manageable screens found on display :0.0

Discovered in Hardy.

** Affects: control-center (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Metacity and Compiz fight to be "compositing manager"
https://bugs.launchpad.net/bugs/231904
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