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I have Ubuntu installed along with Windows XP through Clone CD VCD Demon. Earlier it was working fine but after 2 months, i'm not getting the Dual Boot Option ( OS Selection Screen ) therefore i'm not able to login into Ubuntu, but my system shows that Ubuntu is still there. Can anybody help me out to clear this issue? Thanks in Advance.

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3 Answers

The problem

Grub, Ubuntu's bootloader, seems to have been removed for some reason.

Solution

Boot with a Ubuntu Live CD.

Run the following commands from a Terminal:

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

Click on the "Recommended repair" button, and reboot.

Explanation

Boot-Repair installed Grub to your internal hard drive. This allows you to choose which OS to boot when you start up your computer.


Glossary

Bootloader: a piece of code that runs before any operating system is running. A bootloader is used to boot other operating systems. Each operating system usually has its own bootloader.

GRUB (Grand Unified Bootloader): a bootloader package developed to support multiple operating systems and allow the user to select among them during boot-up. It is Ubuntu's default bootloader.

Command line: the traditional Unix environment , where you type commands to tell the computer what to do.

Terminal: an application that allows you to access the command line. Open it by hitting its keyboard shortcut, Ctrl Alt T

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Thank You Charlo, i will check it. –  R.Rajasekaran Jul 19 '12 at 17:31
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You must have the Ubuntu live CD.

Boot from it, fire up a terminal and enter the following command -

grub-install /dev/sda/

Then follow the on-screen instructions and after the installation finishes, enter this command -

update-grub

Reboot and enjoy. All the best.

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Thank you Akshit, i will check it. –  R.Rajasekaran Jul 19 '12 at 17:32
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Maybe your Grub instalation was removed. To get dual boot option back, you need to install a boot manager, for example, Grub2, Lilo or Burg.

To get Grub back you can try Boot Repair:

  1. Download iso from: http://sourceforge.net/projects/boot-repair-cd/files/

    1. Burn to a CD

    2. Boot from CD and use it to reinstall Grub

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