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I have installed Ubuntu 12.04 (upgraded from 11.10) 32-bit and Windows-7 64-bit simultaneously in my computer. I want to install windows-8 but I haven't any backup of Ubuntu 12.04 to retrieve grub after installing windows. So, my question is :-

Is it possible to repair grub with different version of Ubuntu Live CD? If possible then how could I do that and how risky that process?

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2 Answers 2

Yes, it is possible, but dangerous and silly given the availability of Ubuntu Install CDs.

This should give you the current downloads and Here is a list of mirrors that have all versions(bottom of page).

This site also has several versions.

If you insist on using an old version (again very risky) give this site a try. Basically you mount your partition, change to it, then run grub from your "current" system. This should minimize problems, but is still risky. As with any and all partition (boot loader) edits backup your data ASAP.

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If your on Ubuntu 12.04 then you want the 12.04 install cd, NOT the 11.10. Grub was updated when you installed 12.04. –  coteyr Dec 30 '12 at 15:31
    
I had install lots of package and due to internet problem I could neither download iso file of 12.04 nor reinstall ubuntu... –  nKandel Dec 30 '12 at 15:34
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then download the CD from your windows 8 setup, or a friends computer. Installing an older version of GRUB will work, but if the config file syntax has changed your going to end up with a non-booting system. (also there could be stage2 issues). –  coteyr Dec 30 '12 at 15:42
    
If you mean you have no internet at all, then your going to have to ask a friend for help. –  coteyr Dec 30 '12 at 15:43
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I don't see how this is dangerous at all. Using grub-install to re-install GRUB, even from an older version, will simply install an older version of GRUB in the boot partition, rescan and recreate the GRUB configuration and modify the boot sector accordingly. grub-install even checks for errors before proceeding. Once GRUB is installed, you can reboot and force a reinstall of the newest version. I installed GRUB for my Ubuntu install with an old Debian CD once, and never had any problems. –  netcoder Dec 30 '12 at 17:01
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Interestingly I don't have to recover Grub on installing Window 8 through non bootable pen drive (on clicking setup.exe file). And no problem were arise.

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