Grub installation in ubuntu11.04
 

Hi..All,
In RedHat based O/S I can easily recover grub menu after windows re installation by just running "grub-install /dev/sda". But in ubuntu I could never successfully recover the grub menu. So for practical purpose I installed XP and ubuntu 11.04 as dual boot on Oracle Virtual Box. I re installed the windows XP and now I want to install grub. I booted through Ubuntu11.04 Rescue CD. Here is the partitions details, please find the attachments also.
/dev/sda6 is mounted on /mnt/1 -->/boot partition
/dev/sda7 is mounted on /mnt/2 -->/ partition
/dev/sda8 not mounted --->/home partition
Here I have some confusions as in which I have to install grub when /boot is having separate partition. But I installed it on / partiton using
and found grub installed with no errors
Then I am trying to update the grub using
But I am getting the error as below
If I reboot the machine I am getting the prompt as
and unable to boot either windows or ubuntu
So please help me to recover the grub and in which I have to install grub / or /boot? when /boot is having separate partition

Windows will need to chainload from grub,

If grub is in a separate partition you will need to mount that partition then run the command you have above but for the
(grub-install --root-directory=/mnt/sda? /dev/sda) the '?' being the partition that is your boot partition.

It is easier to do this with a live cd.

Now find a /boot/grub/grub.cfg in the / partition of your ubuntu installation and copy and paste it to your boot partition. If you did hot install grub you will have to make a grub.cfg.file.

I do not know if you have this tutorial on grub2 but check out Section 12 grub2

Thanks for the reply Larry Webb,
This link helped me to recover the grub menu. Thanks for your kind help.