"error: no such device xxx.xxxx.xxxx.xxxx grub rescue"

**drs305** · April 17th, 2011

If you can download and run the boot info script from the following link it will give us all the information in one comprehensive list and it will make it easier to inspect. Run the script from the LiveCD with your externals connected and then post the contents of RESULTS.txt.
http://bootinfoscript.sourceforge.net

**TeoBigusGeekus** · April 17th, 2011

Ok, just a "wild" thing to try here; you're not supposed to edit grub.cfg by hand, but what the heck.

Create a backup of your grub.cfg file. Copy it somewhere safe.

Fire up gedit with

Code:

gksu gedit

and open the grub.cfg file. Delete everything from there and replace it with

Code:

set timeout=5
set default=0

menuentry "Ubuntu" {
set root=(hd1,5)
search --no-floppy --fs-uuid --set 147ae2e4-af83-435b-b0f1-f7fc0137bd85
linux    /boot/vmlinuz-2.6.35-28-generic-pae root=UUID=147ae2e4-af83-435b-b0f1-f7fc0137bd85 ro   quiet splash
initrd    /boot/initrd.img-2.6.35-28-generic-pae
}

Save it and reboot.

If it doesn't work, replace it with your backed up grub.cfg

**TacticalApe** · April 17th, 2011

Code:

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 #5 for (,msdos5)/boot/grub.
 => Windows is installed in the MBR of /dev/sdf

sda1: _________________________________________________________________________

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

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:   /bootmgr /boot/bcd

sdf1: _________________________________________________________________________

    File system:       vfat
    Boot sector type:  -
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files/dirs:   

sdf2: _________________________________________________________________________

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

sdf5: _________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info:  
    Operating System:  Ubuntu 10.10
    Boot files/dirs:   /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img

sdf6: _________________________________________________________________________

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

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

Drive: sda ___________________ _____________________________________________________

Disk /dev/sda: 640.1 GB, 640135028736 bytes
255 heads, 63 sectors/track, 77825 cylinders, total 1250263728 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    *             63 1,222,578,629 1,222,578,567   7 HPFS/NTFS
/dev/sda3       1,222,578,630 1,250,258,624    27,679,995   7 HPFS/NTFS


Drive: sdf ___________________ _____________________________________________________

Disk /dev/sdf: 999.7 GB, 999732936704 bytes
255 heads, 63 sectors/track, 121543 cylinders, total 1952603392 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot         Start           End          Size  Id System

/dev/sdf1                  63   782,694,778   782,694,716   c W95 FAT32 (LBA)
/dev/sdf2         782,696,446 1,952,602,111 1,169,905,666   5 Extended
/dev/sdf5         782,696,448 1,912,672,255 1,129,975,808  83 Linux
/dev/sdf6       1,912,674,304 1,952,602,111    39,927,808  82 Linux swap / Solaris


blkid -c /dev/null: ____________________________________________________________

Device           UUID                                   TYPE       LABEL                         

/dev/loop0                                              squashfs                                 
/dev/sda1        D2F4C645F4C62B93                       ntfs                                     
/dev/sda3        949CA48C9CA46A86                       ntfs       FACTORY_IMAGE                 
/dev/sda: PTTYPE="dos" 
/dev/sdf1        100D-341D                              vfat                                     
/dev/sdf2: PTTYPE="dos" 
/dev/sdf5        147ae2e4-af83-435b-b0f1-f7fc0137bd85   ext4                                     
/dev/sdf6        571f1d8b-8384-43e2-a2b3-4fd27d0ab07d   swap                                     
/dev/sdf: PTTYPE="dos" 
error: /dev/sdb: No medium found
error: /dev/sdc: No medium found
error: /dev/sdd: No medium found
error: /dev/sde: 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)
/dev/sdf1        /media/100D-341D         vfat       (rw,nosuid,nodev,uhelper=udisks,uid=999,gid=999,shortname=mixed,dmask=0077,utf8=1,showexec,flush)
/dev/sdf5        /media/147ae2e4-af83-435b-b0f1-f7fc0137bd85 ext4       (rw,nosuid,nodev,uhelper=udisks)
/dev/sda1        /media/D2F4C645F4C62B93  fuseblk    (rw,nosuid,nodev,allow_other,blksize=4096,default_permissions)


=========================== sdf5/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='(hd1,msdos5)'
search --no-floppy --fs-uuid --set 147ae2e4-af83-435b-b0f1-f7fc0137bd85
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='(hd1,msdos5)'
search --no-floppy --fs-uuid --set 147ae2e4-af83-435b-b0f1-f7fc0137bd85
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 2.6.35-28-generic-pae' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    insmod part_msdos
    insmod ext2
    set root='(hd1,msdos5)'
    search --no-floppy --fs-uuid --set 147ae2e4-af83-435b-b0f1-f7fc0137bd85
    linux    /boot/vmlinuz-2.6.35-28-generic-pae root=UUID=147ae2e4-af83-435b-b0f1-f7fc0137bd85 ro   quiet splash
    initrd    /boot/initrd.img-2.6.35-28-generic-pae
}
menuentry 'Ubuntu, with Linux 2.6.35-28-generic-pae (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    insmod part_msdos
    insmod ext2
    set root='(hd1,msdos5)'
    search --no-floppy --fs-uuid --set 147ae2e4-af83-435b-b0f1-f7fc0137bd85
    echo    'Loading Linux 2.6.35-28-generic-pae ...'
    linux    /boot/vmlinuz-2.6.35-28-generic-pae root=UUID=147ae2e4-af83-435b-b0f1-f7fc0137bd85 ro single 
    echo    'Loading initial ramdisk ...'
    initrd    /boot/initrd.img-2.6.35-28-generic-pae
}
### 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='(hd1,msdos5)'
    search --no-floppy --fs-uuid --set 147ae2e4-af83-435b-b0f1-f7fc0137bd85
    linux16    /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
    insmod part_msdos
    insmod ext2
    set root='(hd1,msdos5)'
    search --no-floppy --fs-uuid --set 147ae2e4-af83-435b-b0f1-f7fc0137bd85
    linux16    /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows 7 (loader) (on /dev/sda1)" {
    insmod part_msdos
    insmod ntfs
    set root='(hd0,msdos1)'
    search --no-floppy --fs-uuid --set d2f4c645f4c62b93
    chainloader +1
}
menuentry "Windows Vista (loader) (on /dev/sda3)" {
    insmod part_msdos
    insmod ntfs
    set root='(hd0,msdos3)'
    search --no-floppy --fs-uuid --set 949ca48c9ca46a86
    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 ###

=============================== sdf5/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/sdf5 during installation
UUID=147ae2e4-af83-435b-b0f1-f7fc0137bd85 /               ext4    errors=remount-ro 0       1
# swap was on /dev/sdf6 during installation
UUID=571f1d8b-8384-43e2-a2b3-4fd27d0ab07d none            swap    sw              0       0
/dev/fd0        /media/floppy0  auto    rw,user,noauto,exec,utf8 0       0

=================== sdf5: Location of files loaded by Grub: ===================


 542.6GB: boot/grub/core.img
 886.2GB: boot/grub/grub.cfg
 401.3GB: boot/initrd.img-2.6.35-28-generic-pae
 542.6GB: boot/vmlinuz-2.6.35-28-generic-pae
 401.3GB: initrd.img
 542.6GB: vmlinuz
=======Devices which don't seem to have a corresponding hard drive==============

sdb sdc sdd sde

**drs305** · April 17th, 2011

Boot the LiveCD. Run the following just to confirm sda is still your Windows drive and sdf has your Ubuntu installation:

Code:

sudo fdisk -l # Lowercase L

If the above provides different results, amend the instructions to reflect the proper drive.

Install Grub2 to the sdf drive/MBR. Do not use the partition number in the second command.

Code:

sudo mount /dev/sdf5 /mnt
sudo grub-install --root-directory=/mnt /dev/sdf

Reboot, and make sure your BIOS boots the external drive (sdf) first.

You should see menu entries for both Ubuntu and Windows. If you don't, after booting Ubuntu, run:

Code:

sudo update-grub

**TeoBigusGeekus** · April 17th, 2011

You're in good hands now - God, I hate grub2....

**TacticalApe** · April 17th, 2011

well, i changed the cfg file like you said and got the same error message. And when I rebooted, my backup of grub.cfg was gone.
the output of "sudo fdisk -l #'

Code:

Disk /dev/sda: 640.1 GB, 640135028736 bytes
255 heads, 63 sectors/track, 77825 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x1549f232

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1       76102   611289283+   7  HPFS/NTFS
/dev/sda3           76103       77825    13839997+   7  HPFS/NTFS

Disk /dev/sdf: 999.7 GB, 999732936704 bytes
255 heads, 63 sectors/track, 121543 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x29a0b216

   Device Boot      Start         End      Blocks   Id  System
/dev/sdf1               1       48721   391347358    c  W95 FAT32 (LBA)
/dev/sdf2           48721      121544   584952833    5  Extended
/dev/sdf5           48721      119059   564987904   83  Linux
/dev/sdf6          119059      121544    19963904   82  Linux swap / Solaris

the other commands gave me this:

Code:

ubuntu@ubuntu:~$ sudo mount /dev/sdf /mnt
mount: /dev/sdf already mounted or /mnt busy
ubuntu@ubuntu:~$ sudo grub-install --root-directory=mnt /dev/sdf
/usr/sbin/grub-probe: error: cannot find a device for mnt/boot/grub (is /dev mounted?).

**drs305** · April 17th, 2011

Originally Posted by TacticalApe

the other commands gave me this:

Code:

ubuntu@ubuntu:~$ sudo mount /dev/sdf /mnt
mount: /dev/sdf already mounted or /mnt busy
ubuntu@ubuntu:~$ sudo grub-install --root-directory=mnt /dev/sdf
/usr/sbin/grub-probe: error: cannot find a device for mnt/boot/grub (is /dev mounted?).

You are missing a / in "--root-directory=/mnt"

If you get a 'already mounted' or 'busy' message, you will have to change the root directory to where sdf is already mounted. You can find out where sdf is mounted by running the command "mount".

If you don't understand, just reboot and run the commands as posted.

**TacticalApe** · April 17th, 2011

OK... I typed in those commands, and rebooted without the cd, and it gave me this:

Code:

error: no such partition
grub rescue>

and when i typed "sudo update-grub" in terminal, it gave me this:

Code:

/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).

**drs305** · April 17th, 2011

If you hold down the SHIFT key during boot do you get a Grub menu? I would suspect not, but if you do let me know.

At the grub prompt, type "ls". See what devices grub finds. If one of the entries shows (hdX,5) or (hdX,msdos5), X being 0, or 1, type:
ls (hdX,5)/boot/grub
Does it find a lot of *.mod files? If it does, we can try another way to boot.

If not, about all I can suggest is to purge and reinstall Grub2 via the 'chroot' link in my signature line. Some of the files may be missing or corrupt, and purging and reinstalling G2 from scratch may fix it.

**TacticalApe** · April 17th, 2011

Do I reboot with or without the cd?
Also, I looked at the chroot link in your signature, and it looks too confusing for me.

Also, if this means anything, I get the same error messages when the EHD isn't plugged in, and that's where I installed ubuntu to. When I fix this, will I still be able to acess Windows when the EHD isn't plugged in?

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