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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

I cannot say exactly when this was resolved, but I can confirm that the
change mentioned in comment #1 has been applied to the udev hooks.

** Changed in: initramfs-tools (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/311927

Title:
  /disk/by-uuid/ does not exist

Status in initramfs-tools package in Ubuntu:
  Fix Released

Bug description:
  Binary package hint: initramfs-tools

  As described in this post http://forum.ubuntuusers.de/topic/disk-byuuid-does-not-exist/ (german) I get the error message above when booting into the (new) kernels 2.6.27-9-generic and 2.6.24-21-generic in about ~50% of the boots. If so, the system says "gave up waiting for root device" and drops me into the initramfs shell (See http://media.ubuntuusers.de/forum/attachments/1752674/initramfs.png). 
  In the other 50% of the cases the system boots and I can check my configuration with

  sudo blkid 
  /dev/sda1: UUID="1A5093135092F4AB" TYPE="ntfs" 
  /dev/sdb1: UUID="b8116d40-b60a-48bf-a387-e525095c44f7" TYPE="ext3" 
  /dev/sdb2: UUID="d4bd4a19-8f56-4c0e-8e7a-742582df5577" TYPE="jfs" 
  /dev/sdb5: TYPE="swap" UUID="91cdb49a-f28e-4ce2-b171-baf6c423f31d".

  In other cases, when the boot was successful (on the same system) I
  get a config like this:

  sudo blkid
  /dev/sda1: UUID="b8116d40-b60a-48bf-a387-e525095c44f7" TYPE="ext3" 
  /dev/sdb1: UUID="1A5093135092F4AB" TYPE="ntfs" 
  /dev/sda2: UUID="d4bd4a19-8f56-4c0e-8e7a-742582df5577" TYPE="jfs" 
  /dev/sda5: TYPE="swap" UUID="91cdb49a-f28e-4ce2-b171-baf6c423f31d"

  (/sda1 and /sdb1 swapped)

  sdb1 is my Linux partition (on a SATA drive) while sda1 should be my
  Win partition (IDE).

  I changed my groot like this
  ## default grub root device
  ## e.g. groot=(hd0,0)
  # groot=b8116d40-b60a-48bf-a387-e525095c44f7

  so, that my boot entry looks like this
  title           Ubuntu 8.10, kernel 2.6.27-9-generic
  uuid            b8116d40-b60a-48bf-a387-e525095c44f7
  kernel          /boot/vmlinuz-2.6.27-9-generic root=UUID=b8116d40-b60a-48bf-a387-e525095c44f7 ro quiet splash
  initrd          /boot/initrd.img-2.6.27-9-generic
  quiet

  If I change it to
   title           Ubuntu 8.10, kernel 2.6.27-9-generic
   root            (hd1,0)
   kernel          /boot/vmlinuz-2.6.27-9-generic root=/dev/sdb1 ro quiet splash
   initrd          /boot/initrd.img-2.6.27-9-generic

  the system doesn't boot at all.
  With the older kernel 2.6.24-19-generic everything works fine. 

  My device.map:
  cat /boot/grub/device.map
  (hd0)	/dev/sda
  (hd1)	/dev/sdb

  As you can see on
  http://media.ubuntuusers.de/forum/attachments/1752674/initramfs.png,
  my linux device is not listed by initramfs (it should have an id like
  ATA SAMSUNG HD502IJ).

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