Grub Error 21

[yetiman64]

Everything seems fine but for

============================= Boot Info Summary: ==============================

=> GAG is installed in the MBR of /dev/sda

You will need to Re-install grub to the MBR from the live disk with /dev/sda5 being the root partition.
From the live disk

sudo mount /dev/sda5 /mnt

Then

sudo grub-install --root-directory=/mnt /dev/sda

.
Then

sudo umount /mnt

And then reboot the machine, grub menu should come up now.
Note windows 7 loader is listed in grub.cfg so re-installing grub will also give access to windows. To access an external os later on just plug it in then in 10.04 run

sudo update-grub

and it should be picked up as bootable by Lucid and added to the menu. To remove from the menu unplug and use the "update-grub" command abve again.

Edit: this is where i got most of the info http://ubuntuforums.org/showthread.php?t=1195275
.particularly section 13.

[grumpy.biatch]

Everything seems fine but for
You will need to Re-install grub to the MBR from the live disk with /dev/sda5 being the root partition.
From the live disk

sudo mount /dev/sda5 /mnt

Then

sudo grub-install --root-directory=/mnt /dev/sda

.
Then

sudo umount /mnt

And then reboot the machine, grub menu should come up now.
Note windows 7 loader is listed in grub.cfg so re-installing grub will also give access to windows. To access an external os later on just plug it in then in 10.04 run

sudo update-grub

and it should be picked up as bootable by Lucid and added to the menu. To remove from the menu unplug and use the "update-grub" command abve again.

Edit: this is where i got most of the info http://ubuntuforums.org/showthread.php?t=1195275
.particularly section 13.

Yeti:

This is what I got so far -

ubuntu@ubuntu:~$ sudo mount /dev/sda5 /mnt
ubuntu@ubuntu:~$ sudo grub-install --root-directory=/mnt /dev/sda
Installation finished. No error reported.
ubuntu@ubuntu:~$ sudo umount /mnt
ubuntu@ubuntu:~$ sudo update-grub
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
ubuntu@ubuntu:~$ sudo mount /dev/sda5 /mnt
ubuntu@ubuntu:~$ sudo update-grub
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).

[grumpy.biatch]

Yeti:

This is what I got so far -

ubuntu@ubuntu:~$ sudo mount /dev/sda5 /mnt
ubuntu@ubuntu:~$ sudo grub-install --root-directory=/mnt /dev/sda
Installation finished. No error reported.
ubuntu@ubuntu:~$ sudo umount /mnt
ubuntu@ubuntu:~$ sudo update-grub
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
ubuntu@ubuntu:~$ sudo mount /dev/sda5 /mnt
ubuntu@ubuntu:~$ sudo update-grub
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).

Yeti,

I got in, thanks a bunch.

Best,

Dave

[MrRichard]

Everything seems fine but for
You will need to Re-install grub to the MBR from the live disk with /dev/sda5 being the root partition.
From the live disk

sudo mount /dev/sda5 /mnt

Then

sudo grub-install --root-directory=/mnt /dev/sda

.
Then

sudo umount /mnt

And then reboot the machine, grub menu should come up now.
Note windows 7 loader is listed in grub.cfg so re-installing grub will also give access to windows. To access an external os later on just plug it in then in 10.04 run

sudo update-grub

and it should be picked up as bootable by Lucid and added to the menu. To remove from the menu unplug and use the "update-grub" command abve again.

Edit: this is where i got most of the info http://ubuntuforums.org/showthread.php?t=1195275
.particularly section 13.

I know this an old post, but THANK YOU SO MUCH! You saved me a lot of lost work!

[fiddler616]

Many many thanks from me, too.

[Rag888]

Yetiman, you da MAN!!

Thankyou so much for the solution.

I have tried EVERYTHING from Boot Repair CD to command line Boot Repair but it FAILED!

I was just going to remove Ubuntu for good, when I saw your solution and thought to give it a try and guess what, it worked!

Thanks agian.

[oldos2er]

Closed, necromancy.