Comment 8 for bug 632594

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Bryce Harrington (bryce) wrote : Re: xvfb 1.9 and/or metacity not working on the buildds

As to the question of how it entered the error path, I can't reproduce the issue on maverick (pasting in the code and running it on a laptop seems to work fine for me). However, from the error messages in the description:

Window manager warning: Failed to contact configuration server; the most common cause is a missing or misconfigured D-Bus session bus daemon. See http://projects.gnome.org/gconf/ for information. (Details - 1: Failed to get connection to session: Cannot spawn a message bus without a machine-id: Unable to load /var/lib/dbus/machine-id: Failed to open file '/var/lib/dbus/machine-id': No such file or directory)

...this seems to be suggesting your dbus service is missing. Is that a possibility?