Adding a menuentry to grub will boot Windows 8 using Grub2 and Secure Boot. In 
/etc/grub.d/40_custom, put the following lines:
 
menuentry 'Windows 8.1 (loader) (on /dev/sda14)' {
        echo "Loading Windows 8.1"
        insmod part_gpt
        insmod fat
        insmod search_fs_uuid
        insmod chain
        search --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 
--hint-baremetal=ahci0,gpt2 44ED-7819
        chainloader (${root})/EFI/Microsoft/Boot/bootmgfw.efi
}
 
Notice: "44ED-7819" should be replaced by your own uid of efi partition.

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https://bugs.launchpad.net/bugs/1091464

Title:
  Unable to chainload Windows 8 with Secure Boot enabled

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