Gave up waiting for root device on Ubuntu 12.10

Question

I've just installed Ubuntu 12.10 to dual boot with Windows 8, but every time I choose Ubuntu from grub menu, it always get stuck at this error and won't boot:

Gave up waiting for root device. Common problems:
 - Boot args (cat /proc/cmdline)
   - Check rootdelay= (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/920903aa-762f-40d2-8126-87f4b0e6f975 does not exist. Dropping to a shell!

BusyBox v1.19.3 (Ubuntu 1:1.10.3-7ubuntu1.1) bult-in shell (ash)
Enter 'help' for a lost of built-in commands.
(initramfs)

I tried with boot-repair, but it doesn't help, here is the log generated it.

Answer 1

If you installed Ubuntu Desktop onto a partition/hard drive which is part of a RAID array, it will fail to boot. Installing Ubuntu Desktop to a RAID array is not supported.

If you have installed Ubuntu Desktop to a RAID array, uninstall Ubuntu, and then install it to a hard drive or partition which is not part of a RAID array and it should boot up just fine.

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I had the same problem, and it was because I installed onto a RAID array. Installing to a partition which was not part of a RAID array solved this issue for me.

Answer 2

I just randomly started typing stuff... try:

(initramfs) blkid
(initramfs) blockdev --rereadpt /dev/sda
(initramfs) blkid
(initramfs) exit

This at least gets you to the desktop where you can begin trouble shooting your problem which is probably due to a proprietary driver or something