This bug was fixed in the package grub2-signed - 1.80.2
--------------- grub2-signed (1.80.2) zesty; urgency=medium
* Rebuild against grub2 2.02~beta3-4ubuntu2.2. (LP: #1696599)
-- Mathieu Trudel-Lapierre <email address hidden> Wed, 14 Jun 2017 14:46:59 -0400
This bug was fixed in the package grub2-signed - 1.80.2
---------------
grub2-signed (1.80.2) zesty; urgency=medium
* Rebuild against grub2 2.02~beta3- 4ubuntu2. 2. (LP: #1696599)
-- Mathieu Trudel-Lapierre <email address hidden> Wed, 14 Jun 2017 14:46:59 -0400