Graphic driver problem in VirtualBox with Ubuntu 12.10

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http://askubuntu.com – I have been running Ubuntu perfectly in VirtualBox for the paste 3 weeks, but suddenly this has gone a bit wrong. The GUI wont start and it returns following error: I have tried the option to reconfigure but nothing happens, so i need to jump back to terminal. Anybody familiar with this problem and how i can repair it? While debugging i encountered another problem which i had not noticed. My dynamic disc is set to ~98GB but Ubuntu does not exactly agree with me: df -H Filesystem Size Used Avail Use% Mounted on /dev/sda1 4.3G 4.3G 0 100% / udev 1.1G 4.1k 1.1G (HowTos)