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It seems to me that we should actually not close this as too localized, because there are situations outside this very narrow one (of being intentionally pranked) where unexpected settings in keyboard layout options could cause this problem. (For example, someone could have forgotten setting it themselves, or they may have gotten the computer from someone else who modified that setting.) The answer here may be helpful to more people; I think this question should remain open.
A co-worker disabled my scroll lock when using my computer the other day. He changed my Keyboard layout options under keyboard layout to make my Ctrl key to act as my Caps Lock.
Got to Settings -> Keyboard Layout -> Options.
There was a Ctrl key position and he had Caps Lock as Ctrl selected.
I'm using Ubuntu 14.04 LTS and I don't see an Options area. It seems Gnome removed the options, but you can get to it here: mikewilliamson.wordpress.com/2014/03/31/…
Caps Lock
andScroll Lock
. I do not care aboutScroll Lock
butCaps Lock
is killing me.