I had the same problem. I found a workaround which might help someone
until the problem is fixed.
Open up gconf-editor, go to apps -> deskbar and change the keybinding to
whatevery you need e.g. for me "space"
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Can't use +Space to start Deskbar
https://bugs.launchpad.net/bugs/88354
You receive
Added a workaround to 88354
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deskbar unable to assign shortcut key
https://bugs.launchpad.net/bugs/95989
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