Franz, I am attaching a series of files to aid in debugging here (a pair
of EFI executables and a test key).  Could you please do the following:

 - on your USB stick (based on any of 12.04.2, 12.10, or 13.04 - doesn't 
matter), mount the UEFI boot partition
 - copy LockDown.efi onto the partition - anywhere is fine
 - copy shimx64.efi to /EFI/ubuntu/BOOTX64.EFI on the partition
 - unmount
 - boot the system to the firmware, and enter the machine in Secure Boot Setup 
mode
 - insert the USB stick in the machine and browse to its UEFI boot partition
 - run ("boot") the LockDown.efi program
 - try to boot the USB stick (either from a normal "boot" option, or by 
browsing to \EFI\ubuntu\BOOTX64.EFI)

Please let me know if this succeeds or if it still fails in the same
way.

** Attachment added: "LockDown.efi"
   
https://bugs.launchpad.net/ubuntu/+source/shim/+bug/1187233/+attachment/3721994/+files/LockDown.efi

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https://bugs.launchpad.net/bugs/1187233

Title:
  Grub2 fails on ASUS X201E with secure boot is enabled

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