I have the same problem with an Acer V5-531. After installing ubuntu 12.04.2 I 
had to manually install "shim-signed grub-efi-amd64-signed 
linux-signed-image-generic" and do "sudo grub-install /dev/sda 
--uefi-secure-boot". I'm able to boot ubuntu either with or without secure boot 
enabled, but Windows 8 boots only with secure boot disabled, otherways I have 
this error:
 /EndEntire
file path: /ACPI(a0341d0,0)/PCI(2,1f)/UnknownMessaging(12)
/HD(2,c880,96000,4cb097d41345de45,a6,f8)/File(\efi\Microsoft\Boot)/File(bootmgfw.efi)/EndEntire
error: cannot load image

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

Title:
  Unable to chainload Windows 8 with Secure Boot enabled

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