Ubuntu 13.10 lost layout switch shortcut

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http://askubuntu.com – After upgrading to ubuntu 13.10, my keyboard layout switch shortcut not functioning any more. I used to use CAPSLOCK key. I tryed to redefine it but could not find any. The layout option settings page has changed and it does not seem to have any possibility to define the short cut. I heavily rely on this feature and it is a pain that each time I need to take mouse on control panel language icon to switch layout. Really appreciate if you help me to resolve this. (HowTos)