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Archive for May 25th, 2009

GRUB error 15 ( Debian/Ubuntu )

Posted by stringofthoughts on May 25, 2009

The reason for grub error 15 is very simple and so is the solution. The error gives you a message “Error 15: File not found!” simply because the file grub wants is not there. why? because grub is looking into a wrong device. You need to make changes to your /boot/grub/menu.lst file to fix the problem so that grub looks into the correct device but first find out where is your root partition.Boot from a live CD -> open terminal .

$ sudo fdisk -l | grep -i linux

This will list your swap and root devices. In our example here

/dev/hda5            1276        1397      979902   82  Linux swap / Solaris
/dev/hda6            1398        2550     9261441   83  Linux

Swap :: /dev/hda5 and Linux root :: /dev/hda6

/dev/hda6 is your root device. /dev/hda6 is written as (hd0,5) in grub. Make sure you understand this if it’s /dev/hda1 in your system then you ‘ll use (hd0,0). It’s always one digit less in (hdX,Y)

Open your menu.lst file and check /dev/hda6 and (hd0,5) is the root device in the file and not any other device. This is the main reason for error 15. Here in our example root is /dev/hda6 so the /boot/grub/menu.lst should look like this

title        Debian GNU/Linux, kernel 2.6.26-2-686
root        (hd0,5)
kernel        /boot/vmlinuz-2.6.26-2-686 root=/dev/hda6 ro
initrd        /boot/initrd.img-2.6.26-2-686

title        Debian GNU/Linux, kernel 2.6.26-2-686 (single-user mode)
root        (hd0,5)
kernel        /boot/vmlinuz-2.6.26-2-686 root=/dev/hda6 ro single
initrd        /boot/initrd.img-2.6.26-2-686

For Ubuntu users it’ll be (hd0,5) and /dev/sda6 .Make sure the root device is correct in this file.

Next file to check is /etc/fstab. Open the file and check the device for swap and root is correct. here is an example

# /etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    defaults        0       0
/dev/hda6 /               ext3    errors=remount-ro 0       1
/dev/hda5 none            swap    sw              0       0
/dev/hdc        /media/cdrom0   udf,iso9660 user,noauto     0       0

Once everything is in place reboot the system. Congratulations you ‘ve just solved your grub problem.

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