Public bug reported:

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

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


** Tags: apport-bug i386 natty

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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

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