I still can't reproduce this bug in 12.04. xev reports Super+Space correctly. However gnome-do fails to bind to Super+Space:
(Do:12793): libdo-WARNING **: Binding '<Super>space' failed! [Error 11:33:27.893] [AbstractKeyBindingService] Failed to bind "Summon Do" to "<Super>space"
That's a separate issue which should be logged as a new bug if it's a problem for you.
I still can't reproduce this bug in 12.04. xev reports Super+Space correctly. However gnome-do fails to bind to Super+Space:
(Do:12793): libdo-WARNING **: Binding '<Super>space' failed! dingService] Failed to bind "Summon Do" to "<Super>space"
[Error 11:33:27.893] [AbstractKeyBin
That's a separate issue which should be logged as a new bug if it's a problem for you.