This is a bug that has been in Ubuntu as long as it has supported full-disk encryption with LUKS. Basically, the caps lock LED does not work. The caps lock key works, but the LED on the keyboard doesn't light up. I have verified that this is the case on many systems. This is very, very irritating, because I have a long passcode that contains the letter "a" (I don't think I am divulging much by saying that), and once in a while I will hit the caps lock key by mistake. Since the LED light doesn't work, I have no idea if I hit it or not.
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