[Bug 888281] Re: Boot from FAT32 error and return to grub menu

[bcbc]

I've just tested the patch on a FAT32 wubi install and it worked as
intended.

In order to test it, I manually edited the /usr/share/grub/grub-
mkconfig_lib file during the installation (patch wasn't installed), used
'diff' to confirm it matched the patch, and then copied it to
/target/usr/share/grub/grub_mkconfig_lib (/target/usr is the mount point
for /dev/loop4 which is for the usr.disk virtual disk). And root.disk
was mounted as /dev/loop2 on /target.

The grub.cfg that was generated during the install is attached, and it shows that usr.disk will be mounted on loop4 by grub and root.disk is mounted as loop2:
insmod part_msdos
insmod fat
set root='(hd1,msdos5)'
search --no-floppy --fs-uuid --set=root 2dab-fe25
loopback loop4 /ubuntu/disks/usr.disk
set root=(loop4)
if loadfont /share/grub/unicode.pf2 ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  insmod part_msdos
  insmod fat
  set root='(hd1,msdos5)'
  search --no-floppy --fs-uuid --set=root 2dab-fe25
  loopback loop2 /ubuntu/disks/root.disk
  set root=(loop2)
  set locale_dir=($root)/boot/grub/locale
  set lang=en_US
  insmod gettext
fi
...

After rebooting and selecting the Wubi install, there was no error or return to the menu. Then running "sudo update-grub" resulted in grub.cfg changing the loop device for usr.disk to loop1 and root.disk to loop0 (as expected):
insmod part_msdos
insmod fat
set root='(hd1,msdos5)'
search --no-floppy --fs-uuid --set=root 2dab-fe25
loopback loop1 /ubuntu/disks/usr.disk
set root=(loop1)
if loadfont /share/grub/unicode.pf2 ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  insmod part_msdos
  insmod fat
  set root='(hd1,msdos5)'
  search --no-floppy --fs-uuid --set=root 2dab-fe25
  loopback loop0 /ubuntu/disks/root.disk
  set root=(loop0)
  set locale_dir=($root)/boot/grub/locale
  set lang=en_US
  insmod gettext
fi


** Attachment added: "Grub generated during the installation (ubiquity)"
   https://bugs.launchpad.net/wubi/+bug/888281/+attachment/2832360/+files/grub.cfg.at.install

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https://bugs.launchpad.net/bugs/888281

Title:
  Boot from FAT32 error and return to grub menu

Status in Wubi, Windows Ubuntu Installer:
  Confirmed
Status in “grub2” package in Ubuntu:
  New

Bug description:
  This problem was observed on an i386 machine with a fresh Wubi
  installation of Ubuntu Oneiric Ocelot on a FAT32 primary partition.

  Booting the default grub menu selection results in the message "You need to load the kernel first", and a subsequent return to the grub menu.
  Once returned to the Grub menu, I only have to press <Enter> to properly boot Oneiric.

  My previous Wubi Natty set-up did not show this error.

  My old machine is set-up for multi-boot:
  1. c: partition FAT32 with Win98se;
  2. XP on NTFS in an extended DOS partition;
  3. a fresh Wubi Oneiric installation on the c:-drive.

  After a fresh Wubi Oneiric install, the Grub menu has only the two default entries.
  My partitions are: (memdisk) (hd0) (loop0) (hd0,msdos5) (hd0,msdos2) (hd1) (hd1,msdos1)..

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