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#1 2012-12-03 13:21:13

jtbwatson
Member
Registered: 2012-12-01
Posts: 13

ERROR: Unable to find real root device 'UUID....'

http://i49.tinypic.com/33d8lnc.jpg

Successfully installed GRUB, finally, and when I go to boot from the drive, I get this error. I was thinking that it's possible that I'm encountering this because it's a USB drive, but I've installed Linux Mint on the same flash drive through the same USB port, so I'm not sure why there would be much of a difference.

Any tips on how to resolve?

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#2 2012-12-03 14:47:13

Mr Green
Iso Developer
Registered: 2010-11-07
Posts: 4,762

Re: ERROR: Unable to find real root device 'UUID....'

Without very much information I can only say check your drives UUID, the error a clue to cause of the problem.


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#3 2012-12-03 19:30:43

jtbwatson
Member
Registered: 2012-12-01
Posts: 13

Re: ERROR: Unable to find real root device 'UUID....'

The UUID is that of the one listed above. I'm thinking that there's a possibility that the kernel is not loading properly. I have decided to settle for xubuntu for ease-purposes and will install archbang once my photoshop class is over in a few weeks smile

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#4 2012-12-03 23:17:37

oliver
Administrator
Registered: 2010-11-04
Posts: 1,769

Re: ERROR: Unable to find real root device 'UUID....'

was this the first boot after an install or after an upgrade?


:wq!

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#5 2012-12-03 23:19:11

oliver
Administrator
Registered: 2010-11-04
Posts: 1,769

Re: ERROR: Unable to find real root device 'UUID....'

jtbwatson wrote:

I'm thinking that there's a possibility that the kernel is not loading properly.

Logically, this makes sense.  It can happen if you merge in a pacnew file that is very vanilla or if the initramfs generation failed for some reason


:wq!

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#6 2012-12-04 12:28:12

jtbwatson
Member
Registered: 2012-12-01
Posts: 13

Re: ERROR: Unable to find real root device 'UUID....'

oliver wrote:

was this the first boot after an install or after an upgrade?

First boot. Cleanly formatted the USB drive then tried to boot and received this error.

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#7 2012-12-04 12:43:20

Mr Green
Iso Developer
Registered: 2010-11-07
Posts: 4,762

Re: ERROR: Unable to find real root device 'UUID....'

May we have output of

sudo fdisk -l

With device connected


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#8 2012-12-04 14:14:23

jtbwatson
Member
Registered: 2012-12-01
Posts: 13

Re: ERROR: Unable to find real root device 'UUID....'

Will post shortly. Need to re-install it to that USB.

edit: the USB i used initially is being used by somebody else. I'll show you the result from a different USB as well as a picture of the error message I will get from it.

Last edited by jtbwatson (2012-12-04 14:26:50)

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#9 2012-12-04 14:45:12

jtbwatson
Member
Registered: 2012-12-01
Posts: 13

Re: ERROR: Unable to find real root device 'UUID....'

#
# /etc/fstab: static file system information
#
# <file system> <dir>   <type>  <options>       <dump>  <pass>
tmpfs           /tmp    tmpfs   nodev,nosuid    0       0
UUID=2EB3-B418 swap swap defaults 0 0
UUID=2ca3b338-143f-48cf-8b91-87ddede69212 / ext4 defaults 0 1

/mnt/install/etc/fstab
from installer mount points option.

[live@archbang ~]$ sudo fdisk -l

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.


Disk /dev/sda: 750.2 GB, 750156374016 bytes, 1465149168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x28bedae4

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      206847      102400    7  HPFS/NTFS/exFAT
/dev/sda2          206848  1465145343   732469248    7  HPFS/NTFS/exFAT

Disk /dev/sdb: 4009 MB, 4009754624 bytes, 7831552 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000ce3ed

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048     1050623      524288   82  Linux swap / Solaris
/dev/sdb2         1050624     7831551     3390464   83  Linux

Disk /dev/sdc: 8021 MB, 8021606400 bytes, 15667200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1   *        2048    15665151     7831552    b  W95 FAT32

Disk /dev/mapper/arch_root-image: 4073 MB, 4073717760 bytes, 7956480 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

[live@archbang ~]

from the actual install usb

http://i50.tinypic.com/nbqceo.jpg
When trying to boot up.

[live@archbang ~]$ sudo blkid
/dev/sda1: LABEL="System Reserved" UUID="407440DC7440D5F6" TYPE="ntfs" 
/dev/sda2: UUID="9E3C44263C43F833" TYPE="ntfs" 
/dev/sdb1: UUID="7dc08972-047a-40de-a378-3c0f0007709b" TYPE="swap" 
/dev/sdb2: UUID="2ca3b338-143f-48cf-8b91-87ddede69212" TYPE="ext4" 
/dev/sdc1: LABEL="MYLINUXLIVE" UUID="CE39-3E09" TYPE="vfat" 
/dev/loop0: TYPE="squashfs" 
/dev/loop1: UUID="d13eeed1-e790-4de3-a6f2-2ba938037789" TYPE="ext4" 
/dev/loop2: UUID="d13eeed1-e790-4de3-a6f2-2ba938037789" TYPE="ext4" 
/dev/mapper/arch_root-image: UUID="d13eeed1-e790-4de3-a6f2-2ba938037789" TYPE="ext4" 
[live@archbang ~]$ 

output from sudo blkid

The target drive *currently* is /dev/sdb2. But that will surely change when I unplug it and if I have another computer I'm working on...yadda yadda

Last edited by jtbwatson (2012-12-04 15:03:15)

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#10 2012-12-04 15:43:38

jtbwatson
Member
Registered: 2012-12-01
Posts: 13

Re: ERROR: Unable to find real root device 'UUID....'

amxa wrote:

Had the same problem until I added usb into the hooks.

mkinitcpio.conf:
HOOKS="base udev usb autodetect pata scsi sata filesystems usbinput resume"

Then you should recreate the initial ramdisk to be able to boot off the usb device.

Recreate the ramdisk via the installer?
I am still relatively new to linux, but I'm trying to make progress!

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#11 2012-12-04 17:50:13

jtbwatson
Member
Registered: 2012-12-01
Posts: 13

Re: ERROR: Unable to find real root device 'UUID....'

Thanks axma! will try this and report back

edit: it worked! now all there is to do is to install it on my 3.0 device and figure out why it's only seeing 3 of 8GB of my RAM, but that's for later. thanks for the help

Last edited by jtbwatson (2012-12-04 18:39:58)

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#12 2012-12-04 23:47:37

Mr Green
Iso Developer
Registered: 2010-11-07
Posts: 4,762

Re: ERROR: Unable to find real root device 'UUID....'

amxa is correct i686 will not see more than ~3.5Gb.

Just checked configs and 'usb' hook is missing from installer version of mkinitcpio.conf. We are of course assuming that most users are installing to an internal storage device rather than external one. It would be easy to add in hook but maybe a warning should be added instead.


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#13 2012-12-05 00:16:42

oliver
Administrator
Registered: 2010-11-04
Posts: 1,769

Re: ERROR: Unable to find real root device 'UUID....'

would it hurt anything to add usb by default?  The cost is a little bigger initramfs image, right?


:wq!

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#14 2012-12-05 00:30:12

Mr Green
Iso Developer
Registered: 2010-11-07
Posts: 4,762

Re: ERROR: Unable to find real root device 'UUID....'

Not at all, it would be the simplest solution. Again if user wishes to edit the file they can do so.

*Note that the new mkinitcpio [in testing at the moment] usb and other hooks will be removed in favour of new 'block' hook.

https://bbs.archlinux.org/viewtopic.php … 5#p1201045


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