Got the same problem.
I also tried without luck to get rid of that shortcut through unity-tweak-tool
and compizconfig-settings-manager.
Ubuntu 14.04.3 LTS
unity 7.2.5+14.04.20150603-0ubuntu1
unity-tweak-tool 0.0.6ubuntu1
compiz
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: compiz (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1452427
Title:
