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Steve2009
October 11th, 2010, 04:21 AM
Hello,
I am new to this forum and relatively new to Ubuntu. I attempted to install manic on my Vaio today only to find that I could not boot because of an error:

Error: No such device <Alphanumeric stuff>
grub rescue>

Someone on another thread said anyone with such an error who is not using Wubi should start a new thread and post the results of the boot info script in order to get help.


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 #1 for /boot/grub.
=> Grub 2 is installed in the MBR of /dev/sdb and looks on the same drive in
partition #1 for (,msdos1)/boot/grub.

sda1: __________________________________________________ _______________________

File system: ext4
Boot sector type: -
Boot sector info:
Operating System:
Boot files/dirs:

sdb1: __________________________________________________ _______________________

File system: ext4
Boot sector type: Grub 2
Boot sector info: Grub 2 is installed in the boot sector of sdb1 and
looks at sector 46535240 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

sdb2: __________________________________________________ _______________________

File system: Extended Partition
Boot sector type: -
Boot sector info:

sdb5: __________________________________________________ _______________________

File system: swap
Boot sector type: -
Boot sector info:

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

Drive: sda ___________________ __________________________________________________ ___

Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 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 2,048 625,139,711 625,137,664 83 Linux


Drive: sdb ___________________ __________________________________________________ ___

Disk /dev/sdb: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders, total 78165360 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition Boot Start End Size Id System

/dev/sdb1 * 2,048 74,864,639 74,862,592 83 Linux
/dev/sdb2 74,866,686 78,163,967 3,297,282 5 Extended
/dev/sdb5 74,866,688 78,163,967 3,297,280 82 Linux swap / Solaris


blkid -c /dev/null: __________________________________________________ __________

Device UUID TYPE LABEL

/dev/loop0 squashfs
/dev/mmcblk0p1 1E3C-FD9E vfat MICROTITAN
/dev/sda1 f0c6d681-01bf-434f-b615-48f672a7d718 ext4 Data
/dev/sda: PTTYPE="dos"
/dev/sdb1 3af01e46-54bb-4357-8b57-ecaa2daab1f2 ext4
/dev/sdb2: PTTYPE="dos"
/dev/sdb5 47993fba-2248-4ea2-9952-3cbf1478388d swap
/dev/sdb: PTTYPE="dos"

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

Device Mount_Point Type Options

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


=========================== sdb1/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 ext2
set root='(hd2,msdos1)'
search --no-floppy --fs-uuid --set 3af01e46-54bb-4357-8b57-ecaa2daab1f2
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=640x480
load_video
insmod gfxterm
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='(hd2,msdos1)'
search --no-floppy --fs-uuid --set 3af01e46-54bb-4357-8b57-ecaa2daab1f2
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 ###
menuentry 'Ubuntu, with Linux 2.6.35-22-generic' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd2,msdos1)'
search --no-floppy --fs-uuid --set 3af01e46-54bb-4357-8b57-ecaa2daab1f2
linux /boot/vmlinuz-2.6.35-22-generic root=UUID=3af01e46-54bb-4357-8b57-ecaa2daab1f2 ro quiet splash
initrd /boot/initrd.img-2.6.35-22-generic
}
menuentry 'Ubuntu, with Linux 2.6.35-22-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd2,msdos1)'
search --no-floppy --fs-uuid --set 3af01e46-54bb-4357-8b57-ecaa2daab1f2
echo 'Loading Linux 2.6.35-22-generic ...'
linux /boot/vmlinuz-2.6.35-22-generic root=UUID=3af01e46-54bb-4357-8b57-ecaa2daab1f2 ro single
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-2.6.35-22-generic
}
### END /etc/grub.d/10_linux ###

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

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
insmod part_msdos
insmod ext2
set root='(hd2,msdos1)'
search --no-floppy --fs-uuid --set 3af01e46-54bb-4357-8b57-ecaa2daab1f2
linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
insmod part_msdos
insmod ext2
set root='(hd2,msdos1)'
search --no-floppy --fs-uuid --set 3af01e46-54bb-4357-8b57-ecaa2daab1f2
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
if [ "x${timeout}" != "x-1" ]; then
if keystatus; then
if keystatus --shift; then
set timeout=-1
else
set timeout=0
fi
else
if sleep --interruptible 3 ; then
set timeout=0
fi
fi
fi
### 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 ###

=============================== sdb1/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
# / was on /dev/sdb1 during installation
UUID=3af01e46-54bb-4357-8b57-ecaa2daab1f2 / ext4 errors=remount-ro 0 1
# swap was on /dev/sdb5 during installation
UUID=47993fba-2248-4ea2-9952-3cbf1478388d none swap sw 0 0

=================== sdb1: Location of files loaded by Grub: ===================


23.7GB: boot/grub/core.img
19.5GB: boot/grub/grub.cfg
22.2GB: boot/initrd.img-2.6.35-22-generic
23.8GB: boot/vmlinuz-2.6.35-22-generic
22.2GB: initrd.img
23.8GB: vmlinuzI have already tried installing Grub on sdb1 to no avail. Any help would be greatly appreciated especially since I need this computer for class asap.

bcbc
October 11th, 2010, 06:32 AM
Don't install grub to /dev/sdb1 - install it to the MBR of the drive you boot from - either /dev/sda or /dev/sdb

Als, the grub menu on /dev/sdb1 refers to (hd2) (/dev/sdc) instead of (hd1) (/dev/sdb). But maybe the uuid override will fix that problem.

Anyway - boot a live cd, mount /dev/sdb1 and install grub again.

sudo mount /dev/sdb1 /mnt
sudo grub-install --root-directory=/mnt/ /dev/sda
sudo grub-install --root-directory=/mnt/ /dev/sdb


Pick the drive you boot from (you don't need to run both grub-install commands, but it won't hurt to do it on both)

Steve2009
October 11th, 2010, 08:13 AM
Don't install grub to /dev/sdb1 - install it to the MBR of the drive you boot from - either /dev/sda or /dev/sdb

Als, the grub menu on /dev/sdb1 refers to (hd2) (/dev/sdc) instead of (hd1) (/dev/sdb). But maybe the uuid override will fix that problem.

Anyway - boot a live cd, mount /dev/sdb1 and install grub again.

sudo mount /dev/sdb1 /mnt
sudo grub-install --root-directory=/mnt/ /dev/sda
sudo grub-install --root-directory=/mnt/ /dev/sdb
Pick the drive you boot from (you don't need to run both grub-install commands, but it won't hurt to do it on both)

You are my hero right now. I have been working on this for hours and I am astonished to see that the solution was something so simple. I had done as much as type the second grub-install command, but the first one is what seems to have solved the problem. Thanks a lot.

bcbc
October 11th, 2010, 08:30 AM
You are my hero right now. I have been working on this for hours and I am astonished to see that the solution was something so simple. I had done as much as type the second grub-install command, but the first one is what seems to have solved the problem. Thanks a lot.

Great, you're welcome :)

Yeah grub, when it doesn't work, can be a real pain. PS you should probably run "sudo update-grub" next time you boot. That will likely change the hd2 references to hd1.