[Bug 1007752] Re: Most recent grub update uses root=/dev/sdX for boot image, may fail to boot

[Daniel Smedegaard Buus]

Sorry for being unclear. With BOOT_IMAGE, I was referring to the output of cat /proc/cmdline, e.g.
BOOT_IMAGE=/@/boot/vmlinuz-3.0.0-17-generic root=/dev/sdq2 ro rootflags=subvol=@ quiet splash vt.handoff=7.

Above is what grub creates on my system with this is /etc/default/grub:

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

So either GRUB_DISABLE_LINUX_UUID is now defaulting to true, or
something else is going on.

Actually, it seems allright in the generated /boot/grub/grub.cfg (see
attached).

I do note, however, the "set root='(hd16,msdos2)'" bit in grub.cfg. This
corresponds exactly to sdq2 with hd0 being sda. It wasn't in grub.cfg I
saw the "root=sdq2", as at that point I wasn't able to boot the system
(root drive being sda), it was when editing the command line in the GRUB
interface.

This may be a wildly inaccurate bug report in that this behavior may
either be the default(?) or it may be much older than the most recent
update. It just happend to coincide with me doing hard drive fiddling
and updates to GRUB rolling in.

** Attachment added: "Generated grub.cfg"
   https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1007752/+attachment/3174567/+files/grub.cfg

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https://bugs.launchpad.net/bugs/1007752

Title:
  Most recent grub update uses root=/dev/sdX for boot image, may fail to
  boot

Status in “grub2” package in Ubuntu:
  Incomplete

Bug description:
  Hello :)

  The recent update (today) of grub,
     grub-pc:amd64 (1.99-21ubuntu3, 1.99-21ubuntu3.1)
     grub-pc-bin:amd64 (1.99-21ubuntu3, 1.99-21ubuntu3.1)
     grub-common:amd64 (1.99-21ubuntu3, 1.99-21ubuntu3.1)
  killed my grub, apart from also looking strange (used to be gray background, and a nice logo splash when booting, now black background and just low-res text when booting).

  The BOOT_IMAGE command defined root as - in my case - /dev/sdq2, while
  at boot it would be /dev/sdb2. Also, this might not stay the same
  regardless, and as I understand it, this should point to either a
  partition UUID or perhaps /dev/disk/by-id/something-or-other?

  In any event, as it stands, all boot options ends with busybox and an
  initramfs prompt. Editing the grub command and fixing the root= to the
  right path before booting will send me normally into Kubuntu where I
  can (hopefully) fix the problem manually.

  Cheerio :)

  Daniel

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xorg 1:7.6+12ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
  Uname: Linux 3.0.0-17-generic x86_64
  NonfreeKernelModules: nvidia zfs zcommon znvpair zavl zunicode
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: amd64
  Date: Sat Jun  2 10:44:50 2012
  InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120421.1)
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)

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