I've read about this, but still can't figure out my problem. I've got a new laptop with windows 8 preinstalled. First thing I did was installing ubuntu, then GRUB, as I always did. Now I can boot Ubuntu, but not windows. While the machine starts I get this message:
Failed to open \EFI\Microsoft\Boot\grubx64.efi - 80000000000000E Failed to load grub Failed to open \EFI\BOOT\grubx64.efi - 80000000000000E Failed to load grub Checking media [FAIL] Checking media [FAIL]
Then GRUB shows up with 4 options
Ubuntu Advanced Settings for Ubuntu Windows Boot Manager (UEFI on /dev/sda1) System setup
Selecting Ubuntu goes fine, but selecting windows outputs this message:
/EndEntire file path: /ACPI(a0....)/PCI... etc. error: cannot load image.
and it returns to GRUB menu. I've read, that installing GRUB with UEFI isn't a good idea. I always had BIOS. I can change the boot option to UEFI secure mode off and Legacy secure mode off. The second one says there are no boot images. How should I repair my bootloader so that I can choose between Ubuntu and Windows?