[Bug 686076] Re: Grub fails to recognise Ubuntu 10.10 on a separate hard disc. Windows 7 is recognised OK

[Andre Quinnett]

I have noticed this as well.   I have several partitions on one large
drive.  I like to test new Linux versions on a separate 30G partition I
have created to be sure that all my software works correctly in the new
version.  This procedure relies on the new grub version being able to
detect the old linux partition.  Both 10.10 and 11.10 are on the same
drive, but seperate partitions.  I also have windows 7 installed on a
completely different drive, which is detected correctly.  Unfortunately
this left me stranded in linux 11.10, and unable to get back to my linux
10.10 OS, and unfortunately linux 11.10 still has several issues that
either slow down my work, or make some of my more important apps crash
when performing key functions.

I am going to try re-installing 10.10 over top my old 10.10 OS
partition, in the hopes that I can get access back.

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https://bugs.launchpad.net/bugs/686076

Title:
  Grub fails to recognise Ubuntu 10.10 on a separate hard disc. Windows
  7 is recognised OK

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: grub2

  I have three hard drives. One has Windows7 Professional - rarely used - the second has Ubuntu 10.10 and the third is for messing about with. Each operating system uses the whole disc.
  I changed the BIOS to boot from the Messing about disc and installed Natty alpha 1 with no problem. It works well (although lots of essential bits seem to be missing from Unity - I am using the "Classic Desktop") but Grub shows only the Natty installation and Windows 7 but not Ubuntu 10.10.
  OS-prober does not show the other installation of Ubuntu either and running sudo update-grub does not help. 
  Changing the boot disc to the Ubuntu 10.10 disc and running update-grub from there produces a menu for all three OSs on booting from that disc but I can not cure the problem in booting from the Natty disc.
  Reinstalling Grub2 did not help.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: grub2 1.99~20101126-1ubuntu3
  ProcVersionSignature: Ubuntu 2.6.37-7.19-generic-pae 2.6.37-rc3
  Uname: Linux 2.6.37-7-generic-pae i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Mon Dec  6 16:53:48 2010
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20101202)
  ProcEnviron:
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2

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