Can't boot after successful installation of 12.04

view story

http://askubuntu.com – Right now I'm on Ubuntu 12.10 x64 LiveUSB. I tried to install it twice but even the installation went successful, it just got stuck on the booting screen with blinking _ Maybe the GRUB is problem? I tried to install this app via terminal, but i got this error: ValueError: bad marshal data (unknown type code) (HowTos)