On Mon, 28 Dec 2009, Mark Phillips wrote:
> Date: Mon, 28 Dec 2009 08:35:54 -0700
> From: Mark Phillips <[email protected]>
> Reply-To: "General Linux/UNIX discussion and help; civil and on-topic"
> <[email protected]>
> To: Phoenix Linux Users <[email protected]>,
> Portland Linux Users Group <[email protected]>
> Subject: [PLUG] Help - Just Hosed My Grub 2 Install and Can't Boot
>
> I was just finishing a new Debian squeeze install on a new laptop, and the
> last step was updating grub to grub 2. I went through
> update-from-grub-legacy, but I hit return before I ticked the box for sda.
> Now my system won't boot - I get error 15 when it starts up with grub. I am
> sure I just wiped out the old grub and did not install the new one. Any
> suggestions on how to go back and fix this problem? I can't boot into either
> windows or Debian.
>
> Thanks!
>
> Mark
Here are some steps to follow:
1. Boot from a linux CD (knoppix, finnux, etc).
2. Mount the root filesystem:
cd /mnt
mkdir sda3 (assuming this is name of your root partition)
mount /dev/sda3 sda3
3. cd into the root filesystem mount point, and then mount the boot
partition (if your /boot resides on its own partition):
cd sda3
mount /dev/sda1 boot
4. Just to be safe, mount /dev and /proc:
mount -t proc none proc
mount -o bind /dev dev
5. chroot into your root filesystem:
chroot . /bin/bash
source /etc/profile
6. Run the command "grub" to enter the interactive grub shell.
7. Once in the grub shell, type the following grub commands:
root (hd0,0)
setup (hd0)
quit
8. Type "exit" to exit the chroot.
9. Unmount all mount points you have previously mounted:
umount boot dev proc
cd ..
umount sda3
10. Reboot. Take the CD out. Enjoy!
Carlos
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