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Repair grub mbr and /boot using ubuntu 9.04 live CD

Hello,

Ubuntu 9.10

I have Ubuntu 9.10 installed on one of my partitions. However, I needed to install Redhat 5.3 on a separate partition. However, doing this broke my GRUB for Ubuntu.

However, I can't boot into my Ubuntu. And I don't have my Live CD.

Is there another way I can restore my GRUB for Ubuntu?

Many thanks,

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RHEL 5.3 or the really old Redhat 5.3 (that probably would've installed LILO)? the most important thing: can you boot into RedHat? – quack quixote Jan 3 '10 at 8:38
Yes. I can boot into redhat. However. I have finished with redhat now. And want my Ubuntu back. I have found my Ubuntu LiveCD and have booted from it. However, how do I restore from the LiveCD? – ant2009 Jan 3 '10 at 11:03
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closed as exact duplicate by quack quixote, Diago Jan 3 '10 at 19:07

This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ for guidance on how to improve it.

1 Answer

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Since you have the LiveCD, follow the process documented at Recovering Ubuntu After Installing Windows.

Make sure you're using a LiveCD that matches the version of Ubuntu installed on the computer. Especially do not use an Ubuntu 9.10 LiveCD to recover an older version of Ubuntu installed on the drive.

Essentially, the instructions boil down to the comand grub-install --root-directory=/path/to/boot /dev/sdX. They go into good detail about preparing the system for that command, what options to use, and how to verify that you got it right, so I won't reproduce any more of the process here.

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Hmmm, seems like the question title should be changed to match the answer, or vice versa :\ – therefromhere Jan 3 '10 at 18:35
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