If you're not a Linux specialist you might get into trouble. Fortunately I managed to launch Firefox and search the web for a solution and that's another positive point regarding Linux operating systems. Since it's open source, you'll find a huge amount of documentation and problems/solutions on forums etc..So I followed some indications and after about 10 min everything worked fine again, menu bars launched correctly.
So for everyone of you which reads this post because he actually encountered the same problem. Just follow the following steps:
- Hit Ctrl+Alt+F1 to switch to the console window. (Hint: you can switch around between different console windows by hitting Ctrl+Alt+
, Ctrl+Alt+F7 will (usually) show you the graphical inteface with the desktop.
- Log in by using your username and password.
- Type the following command:
sudo apt-get install ubuntu-desktop
- After that finished type
sudo apt-get update