[Bug 758887] Re: Following kernel upgrade to 2.6.38-8.42, grub2 generates duplicate entries in the menu

[Manjul Apratim]

After many months of despair, I have an interesting workaround!

My partition and OS setup is still the same - Ubuntu + Arch + Debian + Slackware + Gentoo, each running only ONE kernel.
If I do a `sudo update-grub' in Ubuntu with everything else NOT mounted, I still get the same old results - Ubuntu, Arch and Gentoo show up fine, while Debian has 5 entries, and Slackware has 4. Debian has the following files in its /boot:

config-3.1.0-1-amd64
System.map-3.1.0-1-amd64
initrd.img-3.1.0-1-amd64
vmlinuz-3.1.0-1-amd64

which, as before, correspond to the same kernel.

Slackware has the following files in its /boot:
config
config-generic-2.6.38.7
config-huge-2.6.38.7
initrd-tree
initrd.gz
README.initrd
System.map
System.map-huge-2.6.38.7
System.map-generic-2.6.38.7
vmlinuz
vmlinuz-generic-2.6.38.7
vmlinuz-huge-2.6.38.7

which again correspond to the same kernel, but are causing os-prober to
generate different entries.

If however, I have the Debian and Slackware partitions MOUNTED when I
run os-prober, the Debian entries all condense into one, and the
Slackware entries into two (corresponding to vmlinuz-generic and
vmlinuz-huge), and I have the perfect grub.cfg!

Clearly, os-prober (rather linux-boot-prober) treats unmounted and
mounted partitions differently, and maybe this will be the clue? I will
myself try to look at the code when I can.

Cheers!

Manjul

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https://bugs.launchpad.net/bugs/758887

Title:
  Following kernel upgrade to 2.6.38-8.42, grub2 generates duplicate
  entries in the menu

Status in “grub2” package in Ubuntu:
  New

Bug description:
  Binary package hint: grub2

  I just went with a system update yesterday for Natty Beta 1, and grub2
  upon "sudo update-grub" generates duplicate entries in the menu.

  Here are certain diagnostic outputs:

  -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

  manjul at chaar:~$ uname -a
  Linux chaar 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686 i686 i386 GNU/Linux
  manjul at chaar:~$ dpkg -l | grep linux-image
  ii  linux-image-2.6.38-8-generic          2.6.38-8.42                                Linux kernel image for version 2.6.38 on x86/x86_64
  ii  linux-image-generic                   2.6.38.8.22                                Generic Linux kernel image
  manjul at chaar:~$ sudo update-grub
  [sudo] password for manjul: 
  Generating grub.cfg ...
  Found background: /usr/share/images/grub/Windbuchencom.tga
  Found background image: /usr/share/images/grub/Windbuchencom.tga
  Found linux image: /boot/vmlinuz-2.6.38-8-generic
  Found initrd image: /boot/initrd.img-2.6.38-8-generic
  Found memtest86+ image: /memtest86+.bin
  Found Arch on /dev/sda4
  Found Debian GNU/Linux (wheezy/sid) on /dev/sda7
  Found Slackware Linux (Slackware 13.1.0) on /dev/sda8
  Found Gentoo Base System release 1.12.14 on /dev/sda9
  done

  -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

  I have attached here the file /boot/grub/grub.cfg generated by the
  above command, which will show the duplicate entries - they refer to
  the same linux-image in each of the distros, as is indicated by the
  uuid's

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: grub-pc 1.99~rc1-12ubuntu1
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic i686
  NonfreeKernelModules: wl
  Architecture: i386
  Date: Tue Apr 12 11:22:28 2011
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  ProcEnviron:
   LANGUAGE=en_US:en
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: Upgraded to natty on 2011-04-06 (6 days ago)

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