[Bug 914300] [NEW] GRUB2 does not migrate Legay's 40_custom correctly

[YannUbuntu]

Public bug reported:

Dear GRUB devs, here is a little bug that could be easily fixed:

1) Initial situation: A pc with Linpus OS (uses GRUB Legacy).

2) Then installed Ubuntu 9.04 , which added Linpus in its GRUB Legacy 's 40_custom correctly, as:
title		Linpus Linux RCD (on /dev/sda1)
root		(hd0,0)
kernel		/boot/bzImage ro root=LABEL=linpus vga=0x311 splash=silent loglevel=1 console=tty1 quiet nolapic_timer 
initrd		/boot/initrd-splash.img
savedefault
boot

3) Then added Ubuntu 11.10. Its os-prober does not detect Linpus. Its GRUB2 migrated the 40_custom Linpus entry from Legacy as:
title        Linpus Linux RCD (on /dev/sda1)
root        (hd0,0)
kernel        /boot/bzImage ro root=LABEL=linpus vga=0x311 splash=silent loglevel=1 console=tty1 quiet nolapic_timer
initrd        /boot/initrd-splash.img
savedefault
boot

Result: GRUB2 menu didn't allow boot on Linpus.

Expected result: GRUB2 should have increased +1 the partition number:
(hd0,1) instead of (hd0,0).  (bug and solution confirmed by a French
user: http://forum.ubuntu-fr.org/viewtopic.php?pid=7760671#p7760671 )

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/914300

Title:
  GRUB2 does not migrate Legay's 40_custom correctly

Status in “grub2” package in Ubuntu:
  New

Bug description:
  Dear GRUB devs, here is a little bug that could be easily fixed:

  1) Initial situation: A pc with Linpus OS (uses GRUB Legacy).

  2) Then installed Ubuntu 9.04 , which added Linpus in its GRUB Legacy 's 40_custom correctly, as:
  title		Linpus Linux RCD (on /dev/sda1)
  root		(hd0,0)
  kernel		/boot/bzImage ro root=LABEL=linpus vga=0x311 splash=silent loglevel=1 console=tty1 quiet nolapic_timer 
  initrd		/boot/initrd-splash.img
  savedefault
  boot

  3) Then added Ubuntu 11.10. Its os-prober does not detect Linpus. Its GRUB2 migrated the 40_custom Linpus entry from Legacy as:
  title        Linpus Linux RCD (on /dev/sda1)
  root        (hd0,0)
  kernel        /boot/bzImage ro root=LABEL=linpus vga=0x311 splash=silent loglevel=1 console=tty1 quiet nolapic_timer
  initrd        /boot/initrd-splash.img
  savedefault
  boot

  Result: GRUB2 menu didn't allow boot on Linpus.

  Expected result: GRUB2 should have increased +1 the partition number:
  (hd0,1) instead of (hd0,0).  (bug and solution confirmed by a French
  user: http://forum.ubuntu-fr.org/viewtopic.php?pid=7760671#p7760671 )

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