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I have just installed Ubuntu 12.10 on my PC and the installation completed well. But now the problem is I am unable to boot Windows 8, in GRUB menu it shows both options, If I choose Ubuntu, it boots smoothly and if I choose Windows 8 it shows the following message:

error: device format "ldm/958e9087-d9d5-11e2-be71-0024d7280798/Volume1" invalid : must be (f|h) dN, with 0<= N < 128  

press any key to continue...

and after some seconds... it shows :

A disk read error Press Ctrl+Alt+Del to restart.

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marked as duplicate by Jorge Castro, Radu Rădeanu, Basharat Sialvi, Stephen Myall, aquaherd Jun 21 '13 at 22:07

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
if you have uefi-Bios ( to get to Bios-Settings press at start of booting one of 'Function'-keys as to see in starting screen - which one to press ) - disable Uefi-Bios and enable Efi-Bios - for more details about UEFI - see here : help.ubuntu.com/community/UEFI –  dschinn1001 Jun 21 '13 at 9:04
    
Congrats and welcome to Ubuntu. I once destroyed someones windows partition in an attempt to make a dual-boot machine. This person had to go cold-turkey from windows to Ubuntu, but thanked me later for that. –  user154126 Jun 21 '13 at 12:33

1 Answer 1

  1. Disable SecureBoot in your BIOS ( see this paragraph )
  2. Run Boot-Repair's Recommended Repair
  3. Reboot, you should be able to access both Ubuntu and Windows.
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