Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

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 deleted the Ubuntu partition via Windows and was going to use an USB to re download and install it. But when I restarted the computer the unknown file system and grub rescue screen came up.

Now, I can't even start up Windows. I'm just stuck on the grub rescue screen and I have no idea how to fix it and I'm a complete beginner.

share|improve this question
If you have a Windows Boot disk/CD you can try mending windows, then you can start on the Ubuntu side of things. Good luck – SimplySimon Jun 18 '13 at 21:34

You can use Super Grub2 Disk to repair the boot section (in case that you deleted or corrupted grub when you deleted Ubuntu partition) as the description specifies:

The primary purpose of Super GRUB2 Disk is to help you boot into an OS whose bootloader is broken. Second, and almost as important, is to be a tool to learn more about GRUB2 and the booting process.

Else, you can use a Windows Repair Disk if something more is broken in the Windows boot sequence.

share|improve this answer

You can either:

  • Use a Windows Repair Disk to restore MBR.
  • Use a LiveUSB of Ubuntu to install it again.

If you do not have any of them but there is another computer available, you may use that one to create a Windows Repair disk or an Ubuntu LiveUSB (or both).

Good luck.

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.