[Bug 742967] Re: Wubi grub prompt on install

[Christian Wenz]

does not seem to be fixed for me on a machine where I have two physical
hard disks and install Ubuntu on the second one; Windows is on the first
one. On the same machine installing 10.04 and 10.10 w/ wubi worked like
a charm, but installing 11.04 (both from scratch and via upgrading from
within 10.10) lead to the behavior described above: Wubi prompts to
reboot the machine, Ubuntu install then competes, asks for another
reboot, and then I get to a prompt including a message like "ALERT!
/host/ubuntu/disks/root.disk does not exist". Is there any diagnostic
information I can provide?

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https://bugs.launchpad.net/bugs/742967

Title:
  Wubi grub prompt on install

Status in Wubi, Windows Ubuntu Installer:
  Fix Released
Status in “grub2” package in Ubuntu:
  Fix Released
Status in “grub2” source package in Lucid:
  Fix Released
Status in “grub2” source package in Maverick:
  Fix Released
Status in “grub2” source package in Natty:
  Fix Released

Bug description:
  Installed Wubi Natty Alpha daily-live for the last day or so - it works fine when I install to the same partition as Windows (/dev/sda2) but if I install on /dev/sda3 (other NTFS partition) it fails as follows:
  1. WIndows install completes successfully
  2. Reboot and selecting Ubuntu, to run the Ubiquity Ubuntu install completes successfully
  3. After install, reboot and selecting Ubuntu boots to grub prompt.

  I can't see any difference between the installs on /dev/sda2 and /dev/sda3 except...
  Running "set" from the grub prompt on the /dev/sda3 install shows: 
  ?=0
  color_highlight=black/white
  color_normal=white/black
  lang=
  pager=
  prefix=(memdisk)/boot/grub
  root=loop0
  show_panic_message=false

  whereas running it from the /dev/sda2 install shows:
  ?=0
  color_highlight=black/white
  color_normal=white/black
  default=
  gfxmode=auto
  lang=
  menu_color_highlight=black/light-gray
  menu_color_normal=white/black
  prefix=(memdisk)/boot/grub
  root=loop0
  show_panic_message=false

  
  One thing strange is that (memdisk)/boot/grub does not exist. ls (memdisk)/ shows "wubildr.cfg" and ls (memdisk) "Device memdisk: Filesystem type tarfs - Total size 20 sectors"

  After manually booting the install:
  linux /vmlinuz root=/dev/sda3 loop=/ubuntu/disks/root.disk ro quiet splash
  initrd /initrd.img
  boot
  it runs fine, and then sudo update-grub and it reboots and shows the grub menu the same as the same-partition install does. Note, that the regenerated grub.cfg shows no differences between the old one, but if I hit 'c' and enter "set" again it shows the variables matching that of the /dev/sda2 initial install.

  All the "set" info may be a red-herring. I'm just trying to provide
  any information that might help diagnose this. I've installed other
  versions of Wubi to /dev/sda3 without a problem.

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