This bug was fixed in the package grub2-signed - 1.78
--------------- grub2-signed (1.78) zesty; urgency=medium
* Rebuild against grub2 2.02~beta3-3ubuntu2. (LP: #1447500)
-- Mathieu Trudel-Lapierre <email address hidden> Wed, 11 Jan 2017 12:09:12 -0500
This bug was fixed in the package grub2-signed - 1.78
---------------
grub2-signed (1.78) zesty; urgency=medium
* Rebuild against grub2 2.02~beta3- 3ubuntu2. (LP: #1447500)
-- Mathieu Trudel-Lapierre <email address hidden> Wed, 11 Jan 2017 12:09:12 -0500