After I deleted my Ubuntu partition, I rebooted my computer and I only get a prompt:

grub rescue >

The command ls lists

(hd0) (hd0,msdos5) (hd0,msdos3) (hd0,msdos2) (hd0,msdos1) (hd1) (hd1,msdos1)

I check them one by one:

ls (hd0,msdos5)/
ls (hd0,msdos1)/

But I cannot find the right partition.

  • Do you have another linux installation on your computer?
    – Dalton
    Jul 9, 2014 at 22:09
  • 1
    No, just ubuntu 13.04, but dual with win 7
    – user302065
    Jul 9, 2014 at 22:25
  • And when I tried rebooting by usb or dvd, it said " Error loading operating system"
    – user302065
    Jul 9, 2014 at 22:28
  • It's unclear what you are asking. Please define "right partition" Are you trying to recover a partition that you accidentally deleted?
    – Elder Geek
    Jul 9, 2014 at 23:53
  • I can't post an answer so I write my answer her: create a ubuntu bootable USB, then launch ubuntu from the USB, launch ubuntu terminal and write sudo apt-get install syslinux ENTER and then sudo dd if=/usr/lib/syslinux/mbr.bin of=/dev/sda. To create a bootable USB : ubuntu.com/download/desktop/create-a-usb-stick-on-windows, to launch ubuntu from the usb, press F11 or F12 when your computer boot (before windows start). To launch ubuntu terminal Ctrl - Alt + T
    – MagTun
    Nov 17, 2015 at 13:34

4 Answers 4


Try the following ..

grub rescue > ls
(hd0) (hd0,msdos5) (hd0,msdos3) (hd0,msdos2) (hd0,msdos1) (hd1) (hd1,msdos1)
grub rescue > ls (hd0,msdos1) # try to recognize which partition is this
grub rescue > ls (hd0,msdos2) # let's assume this is the linux partition
grub rescue > set root=(hd0,msdos2)
grub rescue > set prefix=(hd0,msdos2)/boot/grub # or wherever grub is installed
grub rescue > insmod normal # if this produced an error, reset root and prefix to something else ..
grub rescue > normal

For a permanent fix run the following after you successfully boot:

sudo update-grub
sudo grub-install /dev/sdX

where /dev/sdX is your boot drive.

  • 12
    grub rescue > ls (hd0,msdos1) # try to recognize which partition is this -----> I am getting error : Unknown filesystem in each of the three partitions I get listed by the ls Command.Please help.Thanks.
    – Rafed Nole
    Jul 10, 2014 at 13:28
  • 5
    the ls commands should be like "ls (hd0,msdos1) /boot"
    – Aakash
    May 29, 2015 at 20:06
  • 3
    thanks for the reply. but i fixed it by login in through a live USB and issuing 'update-grub' command
    – samsamara
    Jul 14, 2015 at 8:08
  • 1
    Yes. Look here.
    – Amr Ayman
    May 16, 2017 at 4:58
  • 5
    I tries 'ls (hd0,msdos1) /boot' for all. it shows 'unknown filesystem'. what should I do? Please help Jan 22, 2018 at 11:43

To remove GRUB just download Windows 8 or 10 from another PC. Burn the iso into the USB with Rufus. Boot from USB, click Troubleshooting, then Command Prompt, and type:

Bootrec /fixmbr  

Windows will start normally without Ubuntu's GRUB. You can reinstall Ubuntu again.

  • I run the command without the dot at the end:Bootrec /fixmbr
    – draw
    Mar 26, 2017 at 20:43
  • I had the same problem and after a day of searching and trying I think this is the best solution in this case. I have win 10 (UEFI) which works normally. I want to remove grub resuce from my legacy bios and install a new Ubuntu there. However, my laptop does not have CD-ROM. I had created a bootable USB for Ubuntu that worked perfectely for me before. But now the grub rescue refuses to acknowlege it and says uknown filesystem for all the partitions (including the inserted USB). I believe I would have the same problem with bootable USB for windows. So how can I get rid of grub rescue? Nov 3, 2017 at 12:27
  • 1
    It seems that you are not booting from USB correctly! Select your usb from BIOS settings before grub appear!
    – user413862
    Nov 3, 2017 at 16:13
  • Can I legally install Windows 7 this way? I have Windows 7 recovery partition and I am both unable and uninterested in installing Windows 8 on that computer. Nov 17, 2019 at 14:43
  • 2
    It's very important circa 2020 to recognize that fixmbr commands will restore an MBR style boot. If you had UEFI before, it would now be MBR again. I don't see many correct answers floating around, so if you've already fallen into that place, you should look into Windows' mbr2gpt program which is part of the WinPE bootable. It's an absolute PAIN to use, but it works to get your disk back to GPT/UEFI. It possibly also has repair tools to restore a UEFI setup supposing you didn't run fixmbr.
    – user694859
    Apr 24, 2020 at 2:26

Boot your computer on a Ubuntu live-CD or live-USB

then follow the section 2nd option : install Boot-Repair in Ubuntu from this link:


  • 3
    I tried this. It claimed to have repaired it, but it just keeps putting me back to a grub terminal.
    – astromax
    Aug 11, 2015 at 23:26
  • I tried boot-repair and still got black screen. In my case the problem was boot-repair attempted to repair my SD-card on laptop (based on log). So I removed the card from PC and re-ran boot-repair, then the boot was repaired.
    – hakatashi
    Jul 14, 2018 at 16:08

I did the same thing. Deleted Ubuntu partition. I am able to enter into BIOS.

If you have a bootable USB for Ubuntu, enter BIOS and choose the USB first in boot sequence. Restart. Then install Ubuntu again. And you can delete SAFELY this time.

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