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Ok, I know there are lots of answer on that topic, but I've been trying to get out of that for ages with no luck. What happened was that, I had an Ubuntu 14.04 in one partition and windows 7 in another. It was working perfectly, then I needed to downgrade to 12.04, what I did was create yet another partition for that. Everything was working fine, but not satisfied I decide to delete everything and just stay with the windows and then reinstall ubuntu 12.04. Being a complete noob, I opened windows, deleted both ubuntus disks, and restarted my computer. Ever since then I'm in this grub rescue think. I did some research and realized I did something very stupid, and have been trying to solve the problem ever since. I don't have a CD drive to put a windows installation CD on, but I created bootable USB sticks (I tried with windows and both versions of ubuntu) it did not work, whenever I put an USB stick nothing happens. Then I tried the commands on the screen. It goes like that:

ls
(hd0), (hd0,msdos3), (hd0,msdos2), (hd0,msdos1)
ls (hd0,msdos3)
no filestream
ls (hd0,msdos2)
no filestream
ls (hd0,msdos1)
no filesream

I'm really lost here. Please, if anyone can help I'd be so happy!

Cristiana Miranda
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2 Answers2

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Repair solve your problem.

1st option : get a disk including Boot-Repair

The easiest way to use Boot-Repair is to burn one of the following disks and boot on it.

Boot-Repair-Disk is a disk starting Boot-Repair automatically.

Boot-Repair is also included in Linux-Secure-Remix.

Remark : you can also install the ISO on a live-USB (eg via UnetBootin or LiliUSB or Universal USB Installer).

2nd option : install Boot-Repair in Ubuntu

  • either from an Ubuntu live-session (boot your computer on a Ubuntu live-CD or live-USB then choose "Try Ubuntu") or from your installed Ubuntu session (if you can access it)

  • connect to the Internet

  • open a new Terminal, then type the following commands (press Enter after each line):

      sudo add-apt-repository ppa:yannubuntu/boot-repair
  sudo sed 's/trusty/saucy/g' -i /etc/apt/sources.list.d/yannubuntu-boot-repair-trusty.list

 sudo apt-get update
 sudo apt-get install -y boot-repair && (boot-repair &)

Using Boot-Repair

Recommended repair

launch Boot-Repair from either :
    the Dash (the Ubuntu logo at the top-left of the screen)

    or System->Administration->Boot-Repair menu (Ubuntu 10.04 only)
    or by typing 'boot-repair' in a terminal 

Then click the "Recommended repair" button. When repair is finished, note the URL (paste.ubuntu.com/XXXXX) that appeared on a paper, then reboot and check if you recovered access to your OSs.
If the repair did not succeed, indicate the URL to people who help you by email or forum.

This will work for me. I hope this is help you.

Bhagirathsinh Gohil
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Try to follow the discussion here:

Grub rescue - error: unknown filesystem

If it still not working.

Try these steps:

Community
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Atillo Regner Rex
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  • Welcome to Ask Ubuntu! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. ALSO: DO NOT self-advertise here. Thanks. – Kevin Bowen Feb 28 '17 at 01:41