[ubuntu] Mapping key using keybinding utility

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http://ubuntuforums.org – I want to map some keys using the utility under System > Preferences > Keyboard Shortcuts but some keys don't work For Print Capture I assign a key that has code 0xBF and the 'Keyboard Shortcuts' correctly detects it and assign but when I press it nothing happens. Using xev I see the key press is correctly detected. Any idea? (Hardware)