Ubuntu – “invalid EFI file path” while booting Windows


I just got my new working notebook with Windows 8 pre-installed. After installing Ubuntu 12.10 the grub menu says that there is an "invalid EFI file path" and it won't boot Windows. Ubuntu works fine…

Is there anything I can do about this?

Best Answer

you should try to add windows as workaround manually to grub.

At first run

sudo blkid

Here you should see the UUID from your windows partition

open /etc/grub.d/40_custom and paste/edit following code but replace UUID_FROM_WIN8 with your UUID mentioned above.

menuentry "Windows 8 UEFI" {
    search --fs-uuid --no-floppy --set=root UUID_FROM_WIN8
    chainloader (${root})/efi/Microsoft/Boot/bootmgfw.efi

The chainloader should look the same for all windows versions, as far as i know..

After editing grub files you have to run

sudo update-grub

Please test it first and give me some feedback because it could be possible that the efi file won't be found.. but i don't want to give multiple advice in one answer..

hope this helps!