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I have an Asus U35JC running a 64bit Ubuntu and I recently found out that one of my keys, [ is not functioning at all.

Can somebody suggest a neat way of replacing that key with another one, e.g. the Windows key or the CAPS lock key?

I tried reading info on many sites but I'm afraid I might need a detailed explanation of how to deal with xev.

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Does it need to work in X or also on the console? In the case of X look at xmodmap. – Hennes Oct 8 '12 at 23:04

Try using xmodmap:

xmodmap -e "remove lock = Caps_Lock" && xmodmap -e "keycode 66 = bracketleft"    
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