I just installed 12.10 alongside Windows 7. I split my partition into two because disk reader during the installation didn't recognize Windows 7 as being installed on the computer. It installed correctly and I restarted only to find out it wasn't recognized in Grub also and booted straight to Ubuntu.

I read this post and thought of using boot-repair would be fine but I gain this error:

gpt detected. 
Please create bios-boot partition (>1MB, unformed filesystem, bios_grub flag). 
This can be performed via tools such as Gparted. 
Then try again.

I've no idea what it means or what to do next. Suggestions would be appreciated and I have lost my Windows installation disk and I really don't want to have to go looking for it.

EDIT: This is what boot-repair came back with. http://paste.ubuntu.com/1326230/

2 Answers 2


Well the error says it all, you have GPT standard so you must also add a BIOS-Boot or an EFI partition depending on the boot mode of your BIOS.

You can read about here..https://help.ubuntu.com/community/DiskSpace

  • 1
    Ok, that fixed the issue with boot-repair not working. I ran the program, however, it still does not detect Windows 7 on the hard drive. Oct 29, 2012 at 12:19
  • Well, if you had the windows 7 installation disk it would have been easier I suppose... in that case you had to repair your startup, and if that didn't work, you had to go to cmd via repair and type the following: 1. bootrec /fixBoot 2. bootrec /rebuildBCD Hope it helps.
    – ravisvi
    Oct 31, 2012 at 15:35

Hey try going to the terminal via ubuntu and type

sudo update-grub

And if that too doesn't recognise windows then go to terminal and type:

sudo apt-get install os-prober
sudo update-grub
grep menuentry /boot/grub/grub.cfg

If that too doesn't work, see if this might be of any help, https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1007923 It's for 12.04 though.

Let me know if anything worked.

  • Those commands didn't really show me or do anything. The link however worked to an extent. I however, just need to find my disk and repair the bootmgr. I don't know how but I'm sure I'll be able to somewhere. Suggestions would be great, we're halfway there. Nov 2, 2012 at 11:57

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