Comment 19 for bug 941874

I have this same problem with Kubuntu Precise Beta1.
I installed Kubuntu Precise Beta1 successfully (using default partition setup with a single SATA drive) and rebooted. The desktop loads without error. I run apt-get update && apt-get upgrade and then reboot. Now the boot process stops:
…
Gave up waiting for root device. Common problems:
 - Boot args (cat /proc/cmdline)
    - Check root delay= (did the system wait long enough?)
    - Check root= (did the system wait for the right device?)
 - Missing modules (cat /proc/modules; ls /dev)
ALERT! /dev/disk/by-uuid/8e6f9262-9fbb-48fb-b1f1-a5ba22f25554 does not exist.
Dropping to a shell!

BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu2) build in shell (ash)
Enter 'help' for a list of built-in commands

(initramfs) cat /proc/partitions
major minor #blocks name

 11 0 1048575 sr0
  8 0 117220824 sda
252 0 117220823 dm-0