virtualbox.org

My host OS is win7, and guest OS is ubuntu Lucid. Vbox version is 4.0.4.

Now the guest os always stop at "'initrafs>" command line prompt after vbox manager report a message "guru meditation". and i has no any idea on how to recover it.

The context while vbox report this error is: I start and keep the guest OS running, then there is a USB stick plugged on the host. I remember that the USB device being detected by the vbox but failed to assigned to the guest. This detection/assignment action automatically happen endless till the vbox report "guru meditation" error.

The log file for this guest OS can be see at attachment. pls help me. It block me for serval days.

do i post to wrong forumn? so dispointted no any clue has received.

For more hint. I found it was linux boot failure after google. Following is the boot message:
"
mount: mounting /dev on /root/dev failed: No such file or directory
mount: mounting /sys on /root/sys failed: No such file or directory
mount: mounting /proc on /root/proc failed: No such file or directory
Target file system doesn't have /sbin/init
No init found. Try passing init= bootarg

Busybox v1.13.3 (Ubuntu 1:1.13.3-1ubuntu11) built-in shell (ash)
Enter 'help' for a list of built-in commands
(initramfs) _
"

Can i defer from 'Busybox v1.13.3 (Ubuntu 1:1.13.3-1ubuntu11) built-in shell (ash)' sentense that now the failed ubuntu version is ubuntu11?
if answer is 'yes', then i think it was the updation from ubuntu 10.04 to ubuntu 11 that undergo with my careless permission and failed to boot after updating.