system do not restart after update

[bripa]

Hi,

:shock:
After Ubuntu update, the system won't restart.

Now, after BIOS start, I get the following message:
"udevadm trigger is not permitted while udev is unconfigured."
Then, after several seconds appear the following message:
"Gave up waiting for root device. Common problems:

The shell changed, now appear
BusyBox v1.13.3
(initramfs)


What is happening? How to solve it?:confused:
Thanks in advance

Paolo

[bripa]

Solved!
Thanks to many post in various forums.

Here the best:
http://ubuntuforums.org/showthread.php?t=1565714&highlight=udevadm+trigger+boot