Public bug reported:

Using wubi rev 197 I installed Ubuntu 10.10 from Windows XP.
Hard drives and partitions:
2 hard drives (one PATA 160GB, one SATA 500GB)
disk 0 (PATA): Primary partition C: , NTFS, over the entire disk
disk 1 (SATA): Primary partition E: , NTFS , 450 GB, the rest is unpartitioned

Windows XP installed on C:

Steps:
 - downloaded wubi 197
 - installed Ubuntu 10.10 on disk D:
 - reboot into Ubuntu
 - the installation is finished
 - another reboot into ubuntu
...

Then I did an update ( apt-get upgrade) and after that I got the
"/host/ubuntu/disks/root.disk missing" message on each boot and dropping
to shell.

It turns out the grub configuration changed from 
set root='(hd1,msdos1)'
to
set root='(hd0,msdos1)'

and 
linux /boot/vmlinuz-2.6.35-22-generic root=/dev/sdb1 ...
to
linux /boot/vmlinuz-2.6.35-22-generic root=/dev/sda1 ...

As the same error is printed for unclean NTFS (see bug 226622) and that
Ubuntu leaves the NTFS partionion in unclean state after each shutdown
(bug 733816), I first thought this is an issue with unclean FS...

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/738297

Title:
  wubi: boot disk changed after update

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