On a just updated 13.10 (Nov 15) getting shim-signed 1.5 and a new signed 
grubx64.efi 2.00..-19 I see no change in the error.
The UnknownMessage (hex 12)  or decimal 18 is indeed an invalid subtype for the 
messaging type (last valid subtype is decimal 15), so looks like leftover 
garbage in the path buffer?  Why is grub even in the messaging type anyway for 
a hard disk boot?  The beginning of the reported path looks just like a network 
boot looks from efibootmgr -v output.  Should the valid path start at the 
/HD...?  If someone without the problem could look at what the actual path 
chainloader is using could confirm that the /ACPI is present and working on 
their system we could eliminate leftover garbage in the grub path buffer as the 
problem.

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

Title:
  Unable to chainload Windows 8 with Secure Boot enabled

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