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Possible Duplicate:
How to manually install boot loader?

Grub failure when installing 12.4 alongside Windows 7 (50 GB partition for 12.4), need to manually install bootloader. Where can I find this?

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marked as duplicate by Anwar Shah, Mitch, stephenmyall, Mik, Thomas Ward Sep 25 '12 at 13:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Why not installing 12.04 again. – Anwar Shah Sep 25 '12 at 5:46

What you need to do is create a Boot-Repair Live USB or Live CD. This will repair Grub and allow you to boot Windows and Ubuntu again. You can find instructions on creating a Boot-Repair Live USB or CD here.

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install Boot-Repair in Ubuntu

  1. Boot your computer on a Ubuntu live-CD or live-USB.

  2. Choose "Try Ubuntu"

  3. Connect internet

  4. Open a new Terminal Ctrl+Alt+T, then type:

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

  5. Press Enter.

  6. Then type:

    sudo apt-get install -y boot-repair && boot-repair
  7. Press Enter.

Using Boot-Repair

enter image description here

Recommended repair

  1. launch Boot-Repair from either :

    a. The Dash (the Ubuntu logo at the top-left of the screen)

    b. Or System->Administration->Boot-Repair menu (Ubuntu 10.04 only)

    c. Or by typing 'boot-repair' in a terminal

  2. Then click the "Recommended repair" button. When repair is finished, note the URL ( that appeared on a paper, then reboot and check if you recovered access to your OSs.

  3. If the repair did not succeed, indicate the URL to people who help you by email or forum.

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