Possible Duplicate:
How to fix “The system is running in low-graphics mode” error?
The system is running in low-graphics mode error in “Virtualbox”

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:

enter image description here

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   1% /dev
tmpfs           421M  750k  420M   1% /run
none            5.3M     0  5.3M   0% /run/lock
none            1.1G     0  1.1G   0% /run/shm
none            105M  8.2k  105M   1% /run/user
overflow        1.1M     0  1.1M   0% /tmp

If im not wrong my drive looks a bit full?

enter image description here