Another issue with the newest Ubuntu 8.04 release – VirtualBox is broken. Why? The usbfs file system is removed from fstab yet VirtualBox relies on it.

Get it back by adding :

  none /proc/bus/usb usbfs devgid=1001,devmode=664 0 0

to your /etc/fstab and running:

  mount /proc/bus/usb

as root.