Grub2 fails to chainload Windows 7 with error "invalid signature"

Posted by atomicpirate on Super User See other posts from Super User or by atomicpirate
Published on 2012-03-24T12:03:42Z Indexed on 2012/03/25 5:34 UTC
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Filed under:

windows-7

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ubuntu

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grub

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dual-boot

I've built a new UEFI 64-bit system with both Windows 7 and Ubuntu 11.10 installed (on separate hard drives). I'd like to be able to boot Windows 7 from the grub menu, but I have so far been unsuccessful in getting grub to chainload it.

After getting the grub menu, I choose the option for the command line and I can see that bootmgfw.efi is at (hd1,gpt1)/efi/Microsoft/Boot/bootmgfw.efi. However, when I attempt to chainload I get an error:

grub> chainloader (hd1,gpt1)/efi/Microsoft/Boot/bootmgfw.efi
error: invalid signature

I am not sure whether I chose the UEFI boot option when I installed Linux from the LiveCD, and so I am wondering if the grub I have is perhaps unable to chainload in this manner? In any case I am not sure how to get the chainload to work.

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