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How can I repair grub? (How to get Ubuntu back after installing Windows?)

I have/had dual boot with 11.10 and windows 7. I left my laptop running with windows 7 going and I think it did an automatic update and restarted it's self. Now when I turn it on all I get is a black screen with the blinking cursor in the corner.

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marked as duplicate by Eliah Kagan, Jorge Castro, Stephen Myall, hhlp, Luis Jan 11 '13 at 13:08

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2 Answers 2

If you have another computer available you could make a live DVD or usb, boot into it and install boot repair (onto the live usb) by running the commands below. Once installed tell it to re-wright the grub onto the HDD and make sure it doesn't write it onto the live DVD or USB stick.

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair
boot-repair

Read this for more infomation on how to use boot-repair.

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Awesome, thanks. I have a live usb that I made last week just incase I ever needed it. –  jason Jan 12 '12 at 21:33
    
If you need any more help or guidence, let me know :) –  Ross Fleming Jan 12 '12 at 21:35

so the windows update finished succesfully? you can try with super grub2 disk http://www.supergrubdisk.org/ to restore your grub and boot ubuntu if it was only a failure with windows update. Maybe then you can try to repair your windows installation from ubuntu or from a livecd

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