Comment 14 for bug 711571

Xubuntu 11.04 is not running xfdesktop4 4.8.2-1ubutnu1, it is running an older version. Oneiric Ocelot is running the current version and does not have the logoff instead of reboot/shutdown issue. In the status line at the top of the report, the task for natty is still in triaged status, showing this has not been fixed in the release you are using.

xfdesktop4 | 4.8.1-1ubuntu2 | natty/universe | source, amd64, i386
xfdesktop4 | 4.8.2-1ubuntu1 | oneiric/universe | source, amd64, i386

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