Enable Ctrl+Alt+Backspace

Due to Xorg has disabled ctrl-alt-backspace by default
to re-enable Ctrl+Alt+Backspace to shutdown X, need to modifty
.xinitrc file, and add the line below:

setxkbmap -option terminate:ctrl_alt_bksp

here is an article with different solutions.

http://www.ubuntugeek.com/how-to-enabledisable-ctrlaltbackspace-in-ubuntu-9-10-karmic.html

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