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I installed Ubuntu 12.04 from USB. Now there is no option to choose Linux or Windows, because the boot-loader is missing.

  1. Can I repair this using Windows XP, without using Ubuntu or a virtual machine?
  2. Is there is any software for Windows XP (to act as boot-loader)?
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Could you clarify what you mean when you say your boot loader is missing? Are you able to start Ubuntu from your hard drive? If you can then possibly the GRUB boot menu is just hidden. Try pressing the shift key immediately after the BIOS boot completes and Ubuntu starts booting. This is supposed to force the GRUB boot menu to appear. –  irrational John Jun 11 '12 at 4:32
    
look at my answer askubuntu.com/questions/142750/… –  virpara Jun 11 '12 at 4:47
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3 Answers

up vote 1 down vote accepted

If you are still need for windows see NeoSmart BCD You can get it here

Requirements is Dot net framewrok 2x

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You can't fix it using a windows tool. To fix the bootloader you need an ubuntu live cd.

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I answered the question. –  Floyd Jun 11 '12 at 5:22
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Why the trouble to fix Ubuntu boot using Windows tools if you can use Windows to download and burn an Ubuntu Live CD/USB and then use it to easily fix your boot?

Step by step would be:

  1. Using Internet Explorer (or any other browser), got to http://www.ubuntu.com/download and download an Ubuntu ISO image. Any image will do it, it doesn't matter if it is or not the same version you have installed
  2. Using your favorite windows cd burner software (Nero? Windows Explorer? Or try this free one), burn that ISO image to a blank CD. Or download pendrivelinux and burn it to a USB key.
  3. Boot using this CD/USB, open a terminal and type:

    sudo mkdir /mnt/ubuntu
    sudo mount /dev/sda2 /mnt/ubuntu
    sudo grub-install /dev/sda --root-directory=/mnt/ubuntu
    

(that's assuming your boot hard drive is sda and your ubuntu partition is sda2. Numbers and letters may be different in your system, so check this answer for detailed information)

Your boot (and grub menu) will be restored. You can stop here, but it's recommended that, after booting Ubuntu, to issue a final touch:

sudo update-grub
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