This bug was fixed in the package grub2-signed - 1.66.17
--------------- grub2-signed (1.66.17) xenial; urgency=medium
* Rebuild against grub2 2.02~beta2-36ubuntu3.17. (LP: #1527727)
-- Scott Moser <email address hidden> Thu, 25 Jan 2018 10:05:01 -0500
This bug was fixed in the package grub2-signed - 1.66.17
---------------
grub2-signed (1.66.17) xenial; urgency=medium
* Rebuild against grub2 2.02~beta2- 36ubuntu3. 17. (LP: #1527727)
-- Scott Moser <email address hidden> Thu, 25 Jan 2018 10:05:01 -0500