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I have Ubuntu 13.04 installed on my Dell Inspiron 1525. Mine KeyBoard Shortcuts are not working properly. Properly in the sense

Alt + Tab

Works, but

Alt + F12

not working and many more like Screen Lock shortcuts. And yes I have defined it as custom shortcuts properly. And yes it works before but after some "Dist-upgrade" it's not working.

ohh ya.. I am using GNOME 3.8

Please let me know some tweaks so that it will work.

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