I've used Kubuntu as a normal every day desktop for some time and there are two simple annoyances that popup in my mind:

- when I get a notification in the systray that there is an update I click on it but nothing happens. Then I have to click on the Update Manager which also presents itself in the systray as having an update to start the actual update process. Why can't the program giving the notification be started directly from the notification popup window?

- the restart/shutdown dialog is infuriating!. When I click on restart or shutdown I get presented with a full screen overlay in which I have to click again on restart or shutdown. Ok: I understand the need for a confirmation. But the click area is very sensitive and I you accidentally just outside of the icon area you will be dropped back to the desktop. ARGH! Why do UI designers always think that everyone has some sort of FPS aiming capability with the mouse and can repeatedly click with pixel accuracy?