Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have dual Ubuntu 12.04 and Windows 7 installed in my PC. I installed Ubuntu after Windows, and I have issues with GRUB. After installing Ubuntu, there was no boot loader in the start up, with an error message about missing OS. I tried boot repair, I can see the GRUB loader now and can access Ubuntu, uut I am not able to access Windows, even though I can see that in GRUB loader.

I tried to fix the Windows start up with my Windows Live CD, but that removed the GRUB.

What should I do in this case?

share|improve this question
Please run Boot-Repair's Recommended Repair, then indicate the URL that will appear. This will give us valuable information to help you. – LovinBuntu Jul 29 '12 at 0:00

Try opening Ubuntu terminal and executing command

sudo update-grub

share|improve this answer
This worked for me in a similar situation. At the next boot, I held Shift until I got "Missing operating system". Rebooted again, and GRUB showed the list of options, including Ubuntu and Windows 7. – Dan Dascalescu Mar 30 '15 at 10:33

1) You could add a boot entry for Ubuntu in Windows Boot Configaration Data (BCD) store using this guide and so create a dual-boot under control of Windows boot manager.


2) With Ubuntu Live CD reinstall GRUB2 using this guide so this would create a dual-boot under control of GRUB.

share|improve this answer
He already reinstalled grub when he used boot-repair. – Peachy Jul 28 '12 at 6:12
Yes, he reinstalled Grub but then he has used Windows CD to overwrite Grub again.... – snayob Jul 28 '12 at 21:42

It sounds like you accidentally removed your boot loader for windows. You need to get a windows repair disc and use it to restore your boot loader. It is fairly simple to do but you need the disc.

share|improve this answer

I also got the problem like you and this is the way that I followed to fix it.

The simple answer is just re-install the grub loader. It will add all the operating systems on your system to boot menu.


share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.