I've had Karmic installed on my computer for a few days now, and now I'm noticing that when I press keys on my keyboard, sometimes they either don't register, or they register an extra 20 times. Like for example, typing 'a' might return 'aaaaaaaaaaa'. I had this same problem back when I was running a newer version of ubuntu. (I downgraded because my Dell Inspiron 1501 is more compatible with 9.10). I'm not sure if this is because my laptop's keyboard driver is messed up, or if it's just a dirty keyboard. (It seems clean though). I haven't had this problem when I use an external keyboard.
FYI: Typing this question was brutal.