Howdy, I think this is what you want:

https://help.ubuntu.com/community/Grub2#Reinstalling%20from%20LiveCD

I was going to suggest chroot, but I see that is the 3rd option there!

Here is one more I found via google, nice and short and not terribly out of
date:
http://karuppuswamy.com/wordpress/2010/06/02/how-to-chroot-to-ubuntu-using-live-cd-to-fix-grub-rescue-prompt/

Beware if your ubuntu is older it might be grub and not grub2...

Ben


On Mon, Feb 21, 2011 at 8:35 PM, <[email protected]> wrote:

> ---------------------------- Original Message ----------------------------
> Subject: solve one problem, create another problem
> From:    [email protected]
> Date:    Mon, February 21, 2011 5:01 pm
> To:      [email protected]
> --------------------------------------------------------------------------
>
>     I have my system set up as a dual boot with XP and Ubuntu.  I was
> able to resize, enlarge the Ubuntu partition and it looks like all of
> the information is intact, but when I lost the dual boot in doing
> this.  XP runs, but I cannot get the dual boot to include Ubuntu.  I
> have a live CD for Ubuntu and when I go to reinstall I get as far as
> manually installing on the correct partition but I get a message that
> says that I need to specify a partition for the root file.
>
> No root file system is defined
> Please correct this from the partitioning menu
>
> I have the options of
> /
> /boot
> /home
> /tmp
> /usr
> /var
> /srv
> /opt
> /user/local
>
> and it seems that none of these options are working for me.
>     Where I need to install/repair the installation is   /media/sda/7
> hopefully without erasing anything.
>     What am I missing?
>
> Wes Morgan
>
>
>
>
>
> _______________________________________________
> EUGLUG mailing list
> [email protected]
> http://www.euglug.org/mailman/listinfo/euglug
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