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