[Bug 610898] Re: grub-pc upgrade renders computer unbootable when Wubi is installed to partition other than Windows

[bcbc]

I'm wondering what happens to users who've locked grub-pc and grub-
common, but who might allow the update to lupin-support to be processed.
These are mostly 10.04 users, or those who upgraded to 10.10 and were
burned with booting problems.

Will the postinst script for lupin-support do a grub-install?

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https://bugs.launchpad.net/bugs/610898

Title:
  grub-pc upgrade renders computer unbootable when Wubi is installed to
  partition other than Windows

Status in Release Notes for Ubuntu:
  Invalid
Status in Wubi, Windows Ubuntu Installer:
  Triaged
Status in “grub2” package in Ubuntu:
  Invalid
Status in “lupin” package in Ubuntu:
  Fix Released
Status in “grub2” source package in Lucid:
  Fix Committed
Status in “lupin” source package in Lucid:
  Fix Committed
Status in “grub2” source package in Maverick:
  Fix Committed
Status in “lupin” source package in Maverick:
  Fix Committed
Status in “grub2” source package in Natty:
  Invalid
Status in “lupin” source package in Natty:
  Fix Released

Bug description:
  Users with wubi 10.04 are running the latest grub-pc updates, and it's
  installing the grub2 bootloader to their drive MBR, rendering their
  computers unbootable.

  Users are reporting that the computer boots straight to a grub rescue
  prompt, with the error 'no such device xxxxxxx'. They cannot boot
  windows or access their system restore utilities. Grub2 is in the MBR
  pointing to partition #256.

  I first reported this on the #grub IRC channel, in the following bug
  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/576724, and now
  here as it's probably correct to create a new bug (an there's been no
  response yet).

  Here are the links to the ubuntuforums.org threads...
  http://ubuntuforums.org/showthread.php?t=1538228
  http://ubuntuforums.org/showthread.php?t=1537956
  http://ubuntuforums.org/showthread.php?t=1538170
  http://ubuntuforums.org/showthread.php?t=1482621 (this is an older thread, but a new user (softis) added to it and has the same issue).
  http://ubuntuforums.org/showthread.php?t=1540744
  http://ubuntuforums.org/showthread.php?t=1540772
  http://ubuntuforums.org/showthread.php?t=1539672

  I suspect, but cannot be certain, that it may be related to another
  bug in the lupin-support overrides of grub, that fails to identify a
  wubi installed ubuntu, when it has been installed to a partition other
  than the main windows partition.
  https://bugs.launchpad.net/ubuntu/+source/lupin/+bug/604417

  Although not conclusive, it seems that the most affected users
  reported installing wubi to a partition other than windows.

  
  =====================
  FOLLOW UP: Aug 13 2010
  =====================
  I ran a new 10.04 wubi install on two computers. On the first wubi was installed on the same partition as windows. On the second it was installed on an external drive. 

  After installing, I booted wubi on both, connected to the internet and immediately downloaded all updates. When the grub-pc screen was presented, I clicked Forward (without checking the box) and then proceeded to select ALL devices presented to install grub.
  On the WUBI on the same partition as Windows, this had no effect (verified with Bootinfoscript)
  On the WUBI on a different partition than Windows, this installed grub to the MBR of both drives, with grub looking in partition #256.

  ===========
  CONFIRMED:
  ===========
  This only affects WUBI installs on a partition other than windows, therefore, is probably a duplicate of bug 604417.

  
  Side note:
  On both computers, Wubi would not start upon reboot after completion of updates. When I clicked on Ubuntu under the Windows Boot Manager, both computers rebooted. (This is totally unrelated to the MBR issue). To fix I had to boot each wubi install from a grub command line (from a direct ubuntu install),  and then run "sudo update-grub", after which I was able to boot normally into the wubi install using the Windows Boot Manager.  I'm not sure how a user with just wubi would do this!? Chroot from a live CD!?

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