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I had Ubuntu 12.04 + Windows 7 installed, I didn't like Ubuntu hence I deleted the partition. But I forgot to fix the MBR. Also I cannot access the mutiboot option using F12 at startup. So when I start, I get the Lenovo screen with F2, F12 options but none work, and then the screen shows:

unknown filesystem
grub rescue-

with commands ls I get:

(hd0) (hd0,gpt6) (hd0,gpt5) (hd0,gpt4) (hd0,gpt3) (hd0,gpt2) (hd0,gpt1) (cd 0)

and with set I get:

prefix=(hd0,gpt3)/boot/grub
root=hd0,gpt3

may be because I had installed my Ubuntu in gpt3 partition

can anybody fix this problem?

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  • 1
    Possible related thread: superuser.com/questions/179025/…
    – C-dizzle
    Apr 23, 2013 at 13:04
  • Is it a laptop or a desktop? Could we have any details on your motherboard/laptop manufacturer?
    – gronostaj
    Apr 23, 2013 at 13:23
  • It could be F1 or F10 or Del.
    – Alvin Wong
    Apr 23, 2013 at 13:23
  • MBR is a fully separate issue from Bios access and is unrelated. Try spamming the F2 key on boot (hit it repeatedly from boot until you're in bios or back and grub rescue and report back) to see if it just isn't registering right. Is it safe to assume when you reach grub rescue your keyboard is registering keystrokes?
    – nerdwaller
    Apr 23, 2013 at 13:30

1 Answer 1

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I would load the Windows installer DVD into the DVD tray, and change the BIOS to boot from it. That's what did it for me when I had the same issue.

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  • So, to explain the downvote: First you are overlooking the issue that they say they "Can't access bios" (even though the issues are unrelated to MBR). But beyond that, Super User wants questions to be relevant for future users, so it would be helpful for you to explain what to do next if the OP could get the Windows disc booted. It may seem obvious to some, but not always the case.
    – nerdwaller
    Apr 23, 2013 at 13:51

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