Reinstalling GRUB?

mariusD · 01-11-2009, 01:37 AM

Hello,

A few days ago i had windows and linux installed on the same pc and i used grub to get to either of them.
But i had to reinstall windows because of conflict reasons and now there is no GRUB at start up anymore.
Is there a way i could reinstall it so i can access Ubuntu again?

Thank you.

**wmorri** · 01-11-2009, 02:35 AM

Hi,

Here is how to reinstall grub so that it works on your computer. I got it from the Ubuntu forums, but since there is a lot there I just decided to copy and paste the important part:

How to restore Grub from a live Ubuntu cd.

This will restore grub if you already had grub installed but lost it to a windows install or some other occurence that erased/changed your MBR so that grub no longer appears at start up or it returns an error.

(This how to is written for Ubuntu but should work on other systems. The only thing to take note of, when you see "sudo" that will mean to you that the following command should be entered at a root terminal.)

Boot into the live Ubuntu cd. This can be the live installer cd or the older live session Ubuntu cds.

When you get to the desktop open a terminal and enter. (I am going to give you the commands and then I will explain them later)

Code:

sudo grub

This will get you a "grub>" prompt (i.e. the grub shell). At grub>. enter these commands

Code:

find /boot/grub/stage1

This will return a location. If you have more than one, select the installation that you want to provide the grub files.

Next, THIS IS IMPORTANT, whatever was returned for the find command use it in the next line (you are still at grub>. when you enter the next 3 commands)

Code:

root (hd?,?)

Again use the value from the find command i.e. if find returned (hd0,1) then you would enter root (hd0,1)

Next enter the command to install grub to the mbr

Code:

setup (hd0)

Finally exit the grub shell

Code:

quit

Cheers!

mariusD · 01-11-2009, 05:15 AM

Hehe,

Must be the first time something works for me flawlessly from the first try.

Thank you.

**wmorri** · 01-11-2009, 06:00 AM

Hi,

Not a problem. I needed to learn how to do it too, so that I could help other users. So this was a plus for the both of us.

Cheers!

01-11-2009, 01:37 AM	#1 (permalink)
mariusD Registered User Join Date: Dec 2008 Posts: 46 OS: Vista Ultimate,Ubuntu 8.04 32Bit My System	Reinstalling GRUB? Hello, A few days ago i had windows and linux installed on the same pc and i used grub to get to either of them. But i had to reinstall windows because of conflict reasons and now there is no GRUB at start up anymore. Is there a way i could reinstall it so i can access Ubuntu again? Thank you.

01-11-2009, 02:35 AM	#2 (permalink)
wmorri Moderator/Fedora Amb. Join Date: May 2008 Location: /pm/etc Posts: 2,832 OS: Window 7/Fedora 10 My System	Re: Reinstalling GRUB? Hi, Here is how to reinstall grub so that it works on your computer. I got it from the Ubuntu forums, but since there is a lot there I just decided to copy and paste the important part: How to restore Grub from a live Ubuntu cd. This will restore grub if you already had grub installed but lost it to a windows install or some other occurence that erased/changed your MBR so that grub no longer appears at start up or it returns an error. (This how to is written for Ubuntu but should work on other systems. The only thing to take note of, when you see "sudo" that will mean to you that the following command should be entered at a root terminal.) Boot into the live Ubuntu cd. This can be the live installer cd or the older live session Ubuntu cds. When you get to the desktop open a terminal and enter. (I am going to give you the commands and then I will explain them later) Code: sudo grub This will get you a "grub>" prompt (i.e. the grub shell). At grub>. enter these commands Code: find /boot/grub/stage1 This will return a location. If you have more than one, select the installation that you want to provide the grub files. Next, THIS IS IMPORTANT, whatever was returned for the find command use it in the next line (you are still at grub>. when you enter the next 3 commands) Code: root (hd?,?) Again use the value from the find command i.e. if find returned (hd0,1) then you would enter root (hd0,1) Next enter the command to install grub to the mbr Code: setup (hd0) Finally exit the grub shell Code: quit Cheers! __________________ Linux Forever!

01-11-2009, 05:15 AM	#3 (permalink)
mariusD Registered User Join Date: Dec 2008 Posts: 46 OS: Vista Ultimate,Ubuntu 8.04 32Bit My System	Re: Reinstalling GRUB? Hehe, Must be the first time something works for me flawlessly from the first try. Thank you.

01-11-2009, 06:00 AM	#4 (permalink)
wmorri Moderator/Fedora Amb. Join Date: May 2008 Location: /pm/etc Posts: 2,832 OS: Window 7/Fedora 10 My System	Re: Reinstalling GRUB? Hi, Not a problem. I needed to learn how to do it too, so that I could help other users. So this was a plus for the both of us. Cheers! __________________ Linux Forever!