Ubuntu
udev package

root won't mount by UUID, device doesn't exist

Bug #147957 reported by Alex Mauer
10
This bug affects 1 person
Affects Status Importance Assigned to Milestone
udev (Ubuntu)
Won't Fix
Low
Unassigned

Bug Description

My system won't boot using the UUID= syntax, because the root partition doesn't get a /dev/disk/by-uuid link. All the other partitions do:

/dev/disk/by-uuid$ ls -l
total 0
lrwxrwxrwx 1 root root 10 2007-10-01 17:45 00000000433B49BF -> ../../sda1
lrwxrwxrwx 1 root root 10 2007-10-01 17:45 32B88978B8893B7D -> ../../sda4
lrwxrwxrwx 1 root root 10 2007-10-01 23:20 8C3D-06FF -> ../../sdb1
lrwxrwxrwx 1 root root 10 2007-10-01 17:45 9f88936b-5275-4df5-916c-3ac71563ec59 -> ../../sda2
lrwxrwxrwx 1 root root 10 2007-10-01 17:45 a2e4735b-f48b-49d8-8937-3e01da5ea0e9 -> ../../sda7
lrwxrwxrwx 1 root root 10 2007-10-01 17:45 dbd1c76b-6911-46ef-bd3c-aa03755462da -> ../../sda5

It does have a UUID though:

$ sudo dumpe2fs /dev/sda6 | head -n 3
dumpe2fs 1.40.2 (12-Jul-2007)
Filesystem volume name: /
Last mounted on: <not available>
Filesystem UUID: 2b41b6d0-b2d9-4296-9be7-e2928828eaf0

booting with root=/dev/sda6 works fine.

Revision history for this message
Adam Niedling (krychek) wrote :

Has this problem been solved already?

Revision history for this message
Alex Mauer (hawke) wrote :

No, this has not been solved.

Revision history for this message
Craig Maloney (craig-decafbad) wrote :

Please provide more information about this bug,such as the version of Ubuntu you are using, and what kernel version you are using. Also, have you had this issue with Hardy Heron?

Revision history for this message
Alex Mauer (hawke) wrote :

Hardy Heron, kernel 2.6.24-20-generic is the one I'm currently using. All previous kernels have had the same problem.

Revision history for this message
Alex Mauer (hawke) wrote :

2.6.27-1 also has this problem.

Revision history for this message
Alex Mauer (hawke) wrote :

Changing status to prevent expiration

Revision history for this message
Waleed Hamra (w-hamra1987) wrote :

Alex, try the following command in a terminal and see if it helps

sudo ln /dev/sda6 /dev/disk/by-uuid/$(sudo vol_id --uuid /dev/sda6) -s

this will create a uuid entry for your /dev/sda6 which you say is your root partition

Revision history for this message
Alex Mauer (hawke) wrote :

While I would assume that manually symlinking it would work, shouldn't the system do this sort of thing automatically? Isn't that the point of the whole UUID thing? I mean, I can obviously work around it by just setting my root device to /dev/sda6 in fstab and grub, so merely getting it working isn't exactly the problem.

Revision history for this message
Scott James Remnant (Canonical) (canonical-scott) wrote :

Please provide the output of "vol_id /dev/sda6"

Changed in sysvinit:
status: New → Incomplete
Revision history for this message
Alex Mauer (hawke) wrote :

(It's /dev/sda5 now after some Partition Magic use)

$ vol_id /dev/sda5
ID_FS_USAGE=raid
ID_FS_TYPE=LVM2_member
ID_FS_VERSION=LVM2 001
ID_FS_UUID=ZtGwOc-0MgW-no0B-Ic6F-eWz0-txui-YmjS49
ID_FS_UUID_ENC=ZtGwOc-0MgW-no0B-Ic6F-eWz0-txui-YmjS49
ID_FS_LABEL=
ID_FS_LABEL_ENC=
ID_FS_LABEL_SAFE=

Revision history for this message
Scott James Remnant (Canonical) (canonical-scott) wrote :

This is an LVM Physical Volume

What does "lvm pvs" output? How about "lvm vgs" and "lvm lvs" ?

Revision history for this message
Alex Mauer (hawke) wrote :

lvm2 isn't installed. After installing it:

$ sudo lvm pvs
  PV VG Fmt Attr PSize PFree
  /dev/sda5 lvm2 -- 14.65G 14.65G
$ sudo lvm lvs

I don't know of any reason that that device would be an LVM PV.

Revision history for this message
Alex Mauer (hawke) wrote :

Information provided.

Changed in udev:
status: Incomplete → New
Revision history for this message
Scott James Remnant (Canonical) (canonical-scott) wrote :

Have you used LVM in the past on this disk? When you formatted it did you wipe the disk first?

Changed in udev:
importance: Undecided → Low
status: New → Incomplete
Revision history for this message
Alex Mauer (hawke) wrote :

I don't believe I've ever used LVM on this partition. It's possible that I abortively attempted to use LVM on it when the system was installed, which would have been around Dapper Drake or earlier.

Changed in udev:
status: Incomplete → Confirmed
Revision history for this message
Scott James Remnant (Canonical) (canonical-scott) wrote :

Well, the meta-data is there and that's what's confusing things. This is only not removed by manual partitioning software.

Changed in udev:
status: Confirmed → Won't Fix
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