View Full Version : [ubuntu] ALERT! /dev/disk/by-uuid/xxxx does not exist. Dropping to a shell!

November 23rd, 2009, 02:58 AM

Gave up waiting for root device. Common Problems: 3860b6c7e1a
- Boot args (cat /proc/cmdline)
- Check rootdelay= (did 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/0caf0984-6932-46ab-8d54-d3860b6c7e1a does not exist. Dropping to a shell!

Hi, Im sorry if some of my questions sound stupid as Im new to ubuntu. Ive had 9.04 running since June 09, I upgraded to 9.10 about a week after it came out. Up until this morning, I havent had any problems. I was using ubuntu last night no problem, I shut it down, woke up, and now it doesn't seem to boot up. (I didnt use the update manager or anything).

Im dual booting with Windows Xp (and that still seems to work no problems)
Ive tried Recovery Mode at the startup selection, same problem.
Ive tried running the older kernal from the startup selection screen, same problem.
I downloaded the 9.10 Installation CD and am currently running from the cd.

Ive also seen a lot of threads on here with similar or the same problem, but there seems to be so many different solutions, and I dont want to mess anything up even more.

I ran "sudo fdisk -l" in the Terminal and this is what I got:

Disk /dev/sda: 82.0 GB, 81964302336 bytes
255 heads, 63 sectors/track, 9964 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xccb4ccb4

Device Boot Start End Blocks Id System
/dev/sda1 * 1 9964 80035798+ c W95 FAT32 (LBA)

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xe8601faa

Device Boot Start End Blocks Id System
/dev/sdb1 1 60427 485379846 83 Linux
/dev/sdb2 60428 60801 3004155 5 Extended
/dev/sdb5 60428 60801 3004123+ 82 Linux swap / Solaris

I was thinking of reinstalling, but I read that it will overwrite my existing ubuntu OS and I will lose all of my settings, firefox bookmarks, files, ect, so Im leaning away from that solution.

Any help would be appreciated.

November 23rd, 2009, 03:11 PM
I have the same problem since this morning. I tried edit linux boot options in grub by presing "E", then I have deleted UUID and wrote the way to my partition... for example for you

... /dev/sdb1 ro quite splash
then I presed Ctrl+x to boot this kernel and it was good...

but this is the temporary solution, because you must edit it everytime you are booting kernel

November 23rd, 2009, 06:10 PM
I didnt mention before, the 82GB HD contains Windows XP and the 500GB HD has Ubuntu (9.04 Upgraded to 9.10)

Ok I think Ive narrowed my problem down to either Ubuntu 9.10, or my 500GB HD. I ran the LiveCD for Ubuntu 9.10, and could not find a way to mount my 500GB HD. I tried in the terminal, and with Ubuntu's system admin tools, neither were letting me mount it. When I tried running the LiveCD for Ubuntu 9.04, it automatically detected it and had it available from the Places tab on the desktop menu.

Not really sure what to do from here

November 23rd, 2009, 08:21 PM
Ok, so Ive booted up the LiveCD (9.04) so I can access my 500GB HD. But its not letting me delete files from there (I need to clean it up a bit so it fits on my external HD), It keeps telling me permission denied. Could this be the entire problem is that my harddrive is somehow locked or something?

November 23rd, 2009, 09:13 PM
firstly, what version of grub are you using ?

recovering grub legacy (pre 9.04) is different to 9.10 with grub2


November 23rd, 2009, 09:22 PM
For those with dual boot systems -- the how-to is over here --> http://ubuntuforums.org/showthread.php?t=1014708

You will need to know which Grub you're on. Basically, if you're on 9.04 and below, you're on grub legacy (v1), if you have upgraded 9.04 --> 9.10 and HAVE NOT updated grub, then you're still on grub legacy.

If you are running a fresh install of 9.10, then you're on Grub2

To recover Grub under Grub2 then you will need step 12 of http://ubuntuforums.org/showthread.php?t=1195275
Step 12 also links to a more in depth one, covering UID's etc for recovery that way.

As always, post back if you are still having problems.