Grub Update After New UUID Change

[Redalien0304]

Made a Copy (using Gparted) of my Ubuntu 13.10 Partition, gave my Old Partition (ubuntu 13.10) a New UUID. Reinstalled Grub on New Copy of Ubuntu 13.10 using "sudo grub-install /dev/sda". Boots Just fine. Is there an Easy way change my UUID for my Older Ubuntu 13.10? Do i change them in boot/grub/grub.cfg & etc fstab? can i use Grub Customizer? or is there a diffrent way? Any Help is Appreciated. Thanks

[Redalien0304]

Bump Anyone? can Boot-repair deal wit UUiD changes? came across this Link http://askubuntu.com/questions/17144...nother-machine

[monkeybrain20122]

boot from a live usb, run

sudo blkid

this will show the new uuid of your partition
edit /etc/fstab and /boot/grub/grub.cfg for that partition so that the uuid match the output from blikd. For boot/grub/grub.cfg it is easiest to do it with gedit and the 'replace all' function. Make sure you edit the correct files because the live usb has files with the same names and you want to edit the files for the installed version of Ubuntu, which will be in /media... when you view them from the live usb.

That's it, there is no need to reinstall grub, you can run

sudo update-grub

when you reboot into the Ubuntu installed on the partition whose uuid has changed. But that may not be necessary

[DogMatix]

If you want to be able to boot your old 13.10 from the GRUB installed on your new 13.10 can you not just run

sudo update-grub

from your new install.

If you want to actually customise the UUID maybe this will help How do I change UUID of a disk to whatever I want?

[monkeybrain20122]

If you want to be able to boot your old 13.10 from the GRUB installed on your new 13.10 can you not just run

sudo update-grub

from your new install.

If you want to actually customise the UUID maybe this will help How do I change UUID of a disk to whatever I want?

Well no, if you change the uuid of the partition without making the changes in fstab and grub.cfg it wouldn't boot.

[oldfred]

Generally you are not supposed to edit grub.cfg.
But your case is an exception.
I would only modify the first entry as when you boot into your system run sudo update-grub it will totally overwrite grub.cfg and will then have all the correct entries thoughout.

Change example sda6 to your Ubuntu partition
sudo mount /dev/sda6 /mnt
gksudo gedit /mnt/boot/grub/grub.cfg


#May have to do this first as it is write protected also:
sudo chmod +w /mnt/boot/grub/grub.cfg
#Or even this first:
sudo chmod 777 /mnt/boot/grub/grub.cfg

[DogMatix]

Well no, if you change the uuid of the partition without making the changes in fstab and grub.cfg it wouldn't boot.

You don't have to have a disk's UUID in fstab to boot to it.

[Redalien0304]

What about Grub Customizer? Can i just Remove the Old Grub Ubuntu 13.10 Enties from Grub Customizer, & Restart & run sudo update-grub?

[DogMatix]

Running sudo update-grub will give you a fresh grub.cfg file which should list both your old & new 13.10 installs.

Is this what you are trying to achieve?

[Redalien0304]

yep i have ran sudo update-grub twiced. both grub entries boot me Ubuntu 13.10 which is Bigger in Size. My other Ubuntu 13.10 Old is smaller in Size.
Have not made any changes except give Ubuntu 13.10 Old a New UUID.Also made Ubuntu 13.10 New Bigger & Made it the Default Os by Running "sudo grub-install /dev/sda"