This was a bug in a patch we applied to Metacity to show the desktop in
the Alt+Tab switcher.
The problem, as you mentioned, was that more than one desktop was shown
even though you could not switch to the different desktop windows. This
was fixed in a update to metacity in our PPA[1]. The update
Thank you for taking the time to report this bug and helping to make Ubuntu
better. This bug did not have a package associated with it, which is important
for ensuring that it gets looked at by the proper developers. You can learn
more about finding the right package at
https://wiki.ubuntu.com/
** Attachment added: "screenshot.png"
http://launchpadlibrarian.net/20424303/screenshot.png
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Redundant "x-nautilus-desktop" in UME application switcher
https://bugs.launchpad.net/bugs/307972
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