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Old 03-17-2005, 10:55 AM   #1
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Registered: Mar 2005
Location: UK
Posts: 11

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Grub error 21 ubuntu

First attempt at installing ubuntu seemed to go fine up until it rebooted just before then end of the installation process... It just came up with loading grub, then error 21 then nothing. I got the latests version free with a linux magazine.

Any help greatly appreciated, really am a newbie
Old 03-17-2005, 07:41 PM   #2
Registered: Jan 2004
Location: cheshire, uk
Distribution: Ubuntu Hoary
Posts: 605

Rep: Reputation: 32


i did a quick google and turned this up -

Hope this is of some help..
Old 03-17-2005, 07:56 PM   #3
Registered: Feb 2005
Location: Santa Monica, CA, USA
Distribution: Ubuntu 5.04
Posts: 35

Rep: Reputation: 15
Changing the bootloader

I have an issue where grub doesn't want to install - probably because lilo was already installed. Any idea how to change the bootloader to grub? I've tried grub> root (hd0,0) but I get a "selected disk does not exist" message. As i understand it, hd0 just refers to the boot partition, which in my case is hda1. So i don't get it?
Old 03-17-2005, 07:59 PM   #4
Senior Member
Registered: Aug 2003
Location: Honolulu, HI
Distribution: Arch
Posts: 1,380

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I would leave it as lilo..not as many probs..IMHO
Old 03-17-2005, 08:57 PM   #5
Registered: Feb 2005
Location: Santa Monica, CA, USA
Distribution: Ubuntu 5.04
Posts: 35

Rep: Reputation: 15
differing head/sector geometries

I'd be fine settling for Lilo, except it does not work correctly. Maybe you have some insight.
Warning: LBA32 addressing assumed
Reading boot sector from /dev/hda
Warning: Kernel & BIOS return differing head/sector geometries for device 0x80
    Kernel: 65535 cylinders, 16 heads, 63 sectors
      BIOS: 1024 cylinders, 255 heads, 63 sectors
Warning: '/proc/partitions' does not match '/dev' directory structure.
    Name change: '/dev/dm-0' -> '/dev/evms/hda1'
    Name change: '/dev/dm-1' -> '/dev/evms/hda5'
    Name change: '/dev/dm-2' -> '/dev/evms/hda6'
Using MENU secondary loader
Calling map_insert_data

Boot image: /vmlinuz -> boot/vmlinuz-2.6.10-4-386
Mapping RAM disk /initrd.img -> boot/initrd.img-2.6.10-4-386
Added Linux *

Skipping /vmlinuz.old
Boot other: /dev/hda5, loader CHAIN
Fatal: First sector of /dev/hda5 doesn't have a valid boot signature
Old 03-17-2005, 09:16 PM   #6
Registered: Feb 2004
Location: Austin Texas
Distribution: Mandrake 9.2
Posts: 257

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Try going into your BIOS and setting the specific parameters of your hard drives rather than using the "auto" setting


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