I had the cursor skip on an older Dell model (not Ubuntu, Windows), but the cause might be the same - the Nub mouse buton (if that makes sense - the little fing

I had the cursor skip on an older Dell model (not Ubuntu, Windows), but the cause might be the same - the Nub mouse buton (if that makes sense - the little finger mouse? What ever it's called) in the middle of the keyboard would pick up the slightest tap and move the cursor - I ended up disabling it and the problem went away; I've never really experienced it on any other laptop.