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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) built-in shell (ash)
Enter 'help' for a lost of built-in commands.

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

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2 Answers 2

If you installed Ubuntu Desktop onto a partition/hard drive which is part of a RAID array, or an encrypted disk, or on Windows ME, it will likely fail to boot. Installing Ubuntu Desktop onto one of these sources is not supported.

If you have installed Ubuntu Desktop to one of the above sources, and it won't boot:

  1. Uninstall Ubuntu.
  2. Install Ubuntu to a hard drive or partition which is not part of a RAID array, not encrypted, and not on Windows ME, and it should boot up just fine.
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Why do you assume this is Wubi on RAID? –  Oli Aug 29 '13 at 14:53
hes probably not assuming, just telling you not to. –  Lorenzo Von Matterhorn Sep 20 '13 at 17:48

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

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