Lubuntu on EEE PC: Black screen after splash screen

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http://askubuntu.com – I just installed Lubuntu 12.04 on ASUS EEE PC (1225B) and it doesn't work. There apears the splash screen for a second or two and then a black screeen. If I press ESC earlier I can access the console, but I have no idea, how to diagnose the problem. (HowTos)