After restarting my laptop the Alternative Characters Key doesn't work. Although it is set as Right Alt I can't enter Polish characters such as "ł,ó,ą,ę,ż,ź,ć,ń" using it. I always have to go to
System Settings -> Keyboard -> Shortcuts -> Typing and there I just have to change any one of the shortcuts to something else (for example 'disabled') for a moment and then set it again to the previous value. This is really unexpected but after this typing works fine, however it drives me mad that I have to do it every time I start my laptop!
The problem may have started when I installed Wine and a game 'Heroes of Might and Magic III' but I'm not sure. It may as well have begun when I installed some other programmes for Ubuntu such as audio-recorder or lmms. I have tried removing all the recently installed programs including wine but nothing solved the problem. Please, help!