Upgraded 10.04 to 10.10 - killed Grub

[ZaphodFJ]

Hi All,

Machine specifics: Win Vista with Ubuntu 10.04 installed via Wubi. All was running nicely.

Upgraded from 10.04 to 10.10 - killed Grub.

Following other posts, I booted off a 10.04 Live CD and ran boot_info_script. The results are below. It's telling me core.img cannot be found - can someone please tell me what to do next (before I blunder on and make things worse!)

Thanks!


Boot Info Script 0.55 dated February 15th, 2010

============================= Boot Info Summary: ==============================

=> Grub 2 is installed in the MBR of /dev/sda and looks on the same drive in
partition #256 for /boot/grub.

sda1: __________________________________________________ _______________________

File system: vfat
Boot sector type: Vista: Fat 32
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files/dirs: /bootmgr /boot/bcd

sda2: __________________________________________________ _______________________

File system: ntfs
Boot sector type: Windows Vista/7
Boot sector info: No errors found in the Boot Parameter Block.
Operating System: Windows Vista
Boot files/dirs: /bootmgr /Boot/BCD /Windows/System32/winload.exe
/wubildr.mbr /wubildr

sda3: __________________________________________________ _______________________

File system: ntfs
Boot sector type: Windows Vista/7
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files/dirs: /ubuntu/winboot/wubildr.mbr /ubuntu/winboot/wubildr
/ubuntu/disks/root.disk /ubuntu/disks/swap.disk

sda3/Wubi: __________________________________________________ _______________________

File system: ext4
Boot sector type: Grub 2
Boot sector info: Grub 2 is installed in the boot sector of sda3/Wubi
and looks at sector 25680448 of the same hard drive
for core.img, but core.img can not be found at this
location.
Operating System: Ubuntu 10.10
Boot files/dirs: /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img

=========================== Drive/Partition Info: =============================

Drive: sda ___________________ __________________________________________________ ___

Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition Boot Start End Size Id System

/dev/sda1 2,048 20,482,047 20,480,000 27 Hidden HPFS/NTFS
/dev/sda2 * 20,482,048 254,451,711 233,969,664 7 HPFS/NTFS
/dev/sda3 254,451,712 488,394,751 233,943,040 7 HPFS/NTFS


blkid -c /dev/null: __________________________________________________ __________

Device UUID TYPE LABEL

/dev/loop0 squashfs
/dev/loop1 7f7ea9e0-ab6b-4ffa-896a-3211e57756b6 ext4
/dev/sda1 EAEE-EB49 vfat PQSERVICE
/dev/sda2 1E5A005C5A003357 ntfs Acer
/dev/sda3 C8ECAE47ECAE301C ntfs DATA
/dev/sda: PTTYPE="dos"
error: /dev/sdb: No medium found

============================ "mount | grep ^/dev output: ===========================

Device Mount_Point Type Options

aufs / aufs (rw)
/dev/sr0 /cdrom iso9660 (ro,noatime)
/dev/loop0 /rofs squashfs (ro,noatime)


======================== sda3/Wubi/boot/grub/grub.cfg: ========================

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi

function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}

function recordfail {
set recordfail=1
if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}

function load_video {
insmod vbe
insmod vga
}

insmod part_msdos
insmod ntfs
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set c8ecae47ecae301c
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=640x480
load_video
insmod gfxterm
fi
terminal_output gfxterm
insmod part_msdos
insmod ntfs
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set c8ecae47ecae301c
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
set locale_dir=($root)/boot/grub/locale
set lang=en
insmod gettext
if [ "${recordfail}" = 1 ]; then
set timeout=-1
else
set timeout=10
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/10_lupin ###
menuentry "Ubuntu, Linux 2.6.35-28-generic" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set c8ecae47ecae301c
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
linux /boot/vmlinuz-2.6.35-28-generic root=/dev/sda3 loop=/ubuntu/disks/root.disk ro quiet splash
initrd /boot/initrd.img-2.6.35-28-generic
}
menuentry "Ubuntu, Linux 2.6.35-28-generic (recovery mode)" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set c8ecae47ecae301c
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
linux /boot/vmlinuz-2.6.35-28-generic root=/dev/sda3 loop=/ubuntu/disks/root.disk ro single
initrd /boot/initrd.img-2.6.35-28-generic
}
menuentry "Ubuntu, Linux 2.6.32-31-generic" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set c8ecae47ecae301c
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
linux /boot/vmlinuz-2.6.32-31-generic root=/dev/sda3 loop=/ubuntu/disks/root.disk ro quiet splash
initrd /boot/initrd.img-2.6.32-31-generic
}
menuentry "Ubuntu, Linux 2.6.32-31-generic (recovery mode)" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set c8ecae47ecae301c
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
linux /boot/vmlinuz-2.6.32-31-generic root=/dev/sda3 loop=/ubuntu/disks/root.disk ro single
initrd /boot/initrd.img-2.6.32-31-generic
}
### END /etc/grub.d/10_lupin ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows Vista (loader) (on /dev/sda1)" {
insmod part_msdos
insmod fat
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set eaee-eb49
chainloader +1
}
menuentry "Windows Recovery Environment (loader) (on /dev/sda2)" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos2)'
search --no-floppy --fs-uuid --set 1e5a005c5a003357
drivemap -s (hd0) ${root}
chainloader +1
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

============================= sda3/Wubi/etc/fstab: =============================

# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
/host/ubuntu/disks/root.disk / ext4 loop,errors=remount-ro 0 1
/host/ubuntu/disks/swap.disk none swap loop,sw 0 0

================= sda3/Wubi: Location of files loaded by Grub: =================


13.1GB: boot/grub/core.img
11.0GB: boot/grub/grub.cfg
1.2GB: boot/initrd.img-2.6.32-31-generic
2.0GB: boot/initrd.img-2.6.35-28-generic
13.2GB: boot/vmlinuz-2.6.32-31-generic
13.3GB: boot/vmlinuz-2.6.35-28-generic
2.0GB: initrd.img
1.2GB: initrd.img.old
13.3GB: vmlinuz
13.2GB: vmlinuz.old
=======Devices which don't seem to have a corresponding hard drive==============

sdb

[ZaphodFJ]

Forgot to say, when I boot up normally the sequence is:
- BIOS does normal BIOS things
- I get a prompt saying grub rescue>

I don't know what to do next...

[ZaphodFJ]

Problem fixed by following the advice here:
http://ubuntuforums.org/showthread.php?t=1639198

and Solution #2.

In brief - the Ubuntu upgrade process tried to upgrade Grub, which turns out to be a bad idea within Wubi. The solution is to install Lilo.

[Rubi1200]

I am really pleased you found the Wubi Megathread and that it provided you with a solution.

It might be prudent to also lock the grub-* packages as outlined there so as to, hopefully, avoid this the next time you upgrade or there is an update for the grub-* packages.

Please also mark this thread Solved using the Thread Tools near the top of the page. This way, other users who find themselves in a similar situation will also have a working solution.

[bcbc]

+1
You also need to apply the Permanent Fix described in the Wubi megathread or you'll end up with Problem #2 as well.