Ubuntu on macbook 7,1: trackpad-tapping less responsive?

Hi, I've ditched osx for ubuntu and am happy with the concept of using an os-os. However, there are quite a few glitches which make it annoying for me to be happy with the change. And I really want to be happy with the reality besides the concept of using open source. I'm gonna open a file for each of them (which I assume is the right way to do)

First one: I notice the trackpad is far less responsive to tapping than I was used to. I have to tap many times often to simulate clicking or selecting. I've set the sensitivity of the trackpad to the maximum, with no obvious improvement. It's a small, but important annoyance, since I spend a lot of times tapping until ubuntu finally seems to get it right. Costs me quite some time and effort. Tried to search on similar problems, but couldn't find a solution. Is this a known problem?