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Old 07-03-2008, 03:01 PM   #1
mengley
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Registered: Jul 2008
Posts: 3

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Unhappy grub error 18... 21... 2... !


Hi all,

Hope some can shed some light on this problem for me.

Trying to install Ubuntu 8.04 on a USB harddrive. Ive unplugged my (hardware raided) SATA drives to save myself overwriting my MBR (again). When I install straight to the disk with the partitions like:

Setup A:
60Gb - ext - Ubuntu (mounted at /) + boot loader
8Gb - Swap
~250Gb - free space

I get a Grub error 18. Forums I looked at largely attribute this to old harware and bios settings but my mobo is <1 year old and none of the setting people talk about fixing the problem are in my bios as far as I can see. mobo is a asus p5n32-e sli plus.

When I go like:

Setup B:
50Mb - ext 3 - boot loader
60Gb - ext 3 - ubuntu
~250Gb - free space

I get grub error 21. Couldnt find much info on fixing this.

After somehow screwing up and getting an error 2 Ive gone back to try setup A again and am getting 18 again.

If anyone has any ideas how to sort this Id be very grateful.

My /boot/grub/menu.lst looks like:
Code:
# menu.lst - See: grub(8), info grub, update-grub(8)
#            grub-install(8), grub-floppy(8),
#            grub-md5-crypt, /usr/share/doc/grub
#            and /usr/share/doc/grub-doc/.

## default num
# Set the default entry to the entry number NUM. Numbering starts from 0, and
# the entry number 0 is the default if the command is not used.
#
# You can specify 'saved' instead of a number. In this case, the default entry
# is the entry saved with the command 'savedefault'.
# WARNING: If you are using dmraid do not use 'savedefault' or your
# array will desync and will not let you boot your system.
default		0

## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout		3

## hiddenmenu
# Hides the menu by default (press ESC to see the menu)
hiddenmenu

# Pretty colours
#color cyan/blue white/blue

## password ['--md5'] passwd
# If used in the first section of a menu file, disable all interactive editing
# control (menu entry editor and command-line)  and entries protected by the
# command 'lock'
# e.g. password topsecret
#      password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
# password topsecret

#
# examples
#
# title		Windows 95/98/NT/2000
# root		(hd0,0)
# makeactive
# chainloader	+1
#
# title		Linux
# root		(hd0,1)
# kernel	/vmlinuz root=/dev/hda2 ro
#

#
# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST

### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below

## DO NOT UNCOMMENT THEM, Just edit them to your needs

## ## Start Default Options ##
## default kernel options
## default kernel options for automagic boot options
## If you want special options for specific kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
##      kopt_2_6_8=root=/dev/hdc1 ro
##      kopt_2_6_8_2_686=root=/dev/hdc2 ro
# kopt=root=UUID=e7cfc379-f994-4dfd-86a5-0d7585fab9aa ro

## Setup crashdump menu entries
## e.g. crashdump=1
# crashdump=0

## default grub root device
## e.g. groot=(hd0,0)
# groot=(hd0,0)

## should update-grub create alternative automagic boot options
## e.g. alternative=true
##      alternative=false
# alternative=true

## should update-grub lock alternative automagic boot options
## e.g. lockalternative=true
##      lockalternative=false
# lockalternative=false

## additional options to use with the default boot option, but not with the
## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash

## should update-grub lock old automagic boot options
## e.g. lockold=false
##      lockold=true
# lockold=false

## Xen hypervisor options to use with the default Xen boot option
# xenhopt=

## Xen Linux kernel options to use with the default Xen boot option
# xenkopt=console=tty0

## altoption boot targets option
## multiple altoptions lines are allowed
## e.g. altoptions=(extra menu suffix) extra boot options
##      altoptions=(recovery) single
# altoptions=(recovery mode) single

## controls how many kernels should be put into the menu.lst
## only counts the first occurence of a kernel, not the
## alternative kernel options
## e.g. howmany=all
##      howmany=7
# howmany=all

## should update-grub create memtest86 boot option
## e.g. memtest86=true
##      memtest86=false
# memtest86=true

## should update-grub adjust the value of the default booted system
## can be true or false
# updatedefaultentry=false

## should update-grub add savedefault to the default options
## can be true or false
# savedefault=false

## ## End Default Options ##

title		Ubuntu 8.04, kernel 2.6.24-16-generic
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-16-generic root=UUID=e7cfc379-f994-4dfd-86a5-0d7585fab9aa ro quiet splash
initrd		/boot/initrd.img-2.6.24-16-generic
quiet

title		Ubuntu 8.04, kernel 2.6.24-16-generic (recovery mode)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-16-generic root=UUID=e7cfc379-f994-4dfd-86a5-0d7585fab9aa ro single
initrd		/boot/initrd.img-2.6.24-16-generic

title		Ubuntu 8.04, memtest86+
root		(hd0,0)
kernel		/boot/memtest86+.bin
quiet

### END DEBIAN AUTOMAGIC KERNELS LIST
and sudo fdisk -l
Code:
Disk /dev/sda: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000d64f4

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        7295    58597056   83  Linux
/dev/sda2            7296        8268     7815622+  82  Linux swap / Solaris
 
Old 07-03-2008, 05:29 PM   #2
alan_ri
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Registered: Dec 2007
Location: Croatia
Distribution: Debian GNU/Linux
Posts: 1,733
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Did you checked if USB hard drive is recognized by BIOS?
 
Old 07-03-2008, 06:39 PM   #3
bigrigdriver
LQ Addict
 
Registered: Jul 2002
Location: East Centra Illinois, USA
Distribution: Debian stable
Posts: 5,877

Rep: Reputation: 350Reputation: 350Reputation: 350Reputation: 350
From "Solving Boot Problems with Grub - 2nd Edition":
Quote:
Grub Error 18 : Selected cylinder exceeds maximum supported by BIOS
This error is returned when a read is attempted at a linear block
address beyond the end of the BIOS translated area. This generally
happens if your disk is larger than the BIOS can handle (512MB for
(E)IDE disks on older machines or larger than 8GB in general).
You need to check the USB drive settings in the BIOS. Make sure it is set to LBA (Large Block Assignment) in the drive size settings.
Quote:
Grub Error 21 : Selected disk does not exist
This error is returned if the device part of a device- or full
file name refers to a disk or BIOS device that is not present or
not recognized by the BIOS in the system.
Goes hand-in-hand with the error 18 above.
 
Old 07-06-2008, 01:02 PM   #4
mengley
LQ Newbie
 
Registered: Jul 2008
Posts: 3

Original Poster
Rep: Reputation: 0
odd

Ok well I have now gotten it to boot from the disk... Oddly enough it seems to boot fine if I hit F8 during startup and pick the disk from the boot menu, rather than letting it find it automatically. I guess I can live with this behaviour, just seems a little odd...
 
Old 07-06-2008, 01:16 PM   #5
alan_ri
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Registered: Dec 2007
Location: Croatia
Distribution: Debian GNU/Linux
Posts: 1,733
Blog Entries: 5

Rep: Reputation: 127Reputation: 127
I don't think it's odd,I think it's just that you have entered into the BIOS boot menu and not in the BIOS itself.You should go in the BIOS setup menu and change from where will BIOS try to boot first.
 
Old 07-06-2008, 01:34 PM   #6
mengley
LQ Newbie
 
Registered: Jul 2008
Posts: 3

Original Poster
Rep: Reputation: 0
Im pretty sure its trying to boot the disk when I let it run thru. perhaps its showing up as a hdd rather than as "removable". hmm Ill investigate -

nope definately is trying to boot the USB HDD first (altho I believe it is indeed showing up as a HDD). Just get the grub error if I let it run straight thru. very odd.

oh well, as I say I can live with this. It means I dont have to unplug it every time to reboot.

Last edited by mengley; 07-06-2008 at 01:48 PM.
 
  


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