This bug was fixed in the package grub2 - 2.02~beta3-4ubuntu2
---------------
grub2 (2.02~beta3-4ubuntu2) zesty; urgency=medium
* debian/build-efi-images: provide a new grub EFI image which enforces that
loaded kernels are signed for Secure Boot: build gsb$arch.efi; which is
the same as grub$arch.efi minus the 'linux' module. Without fallback to
'linux' for unsigned loading, this makes it effectively enforce having a
signed kernel. (LP: #1401532)
-- Mathieu Trudel-Lapierre <cypher...@ubuntu.com> Thu, 30 Mar 2017
17:45:23 -0400
** Changed in: grub2 (Ubuntu Zesty)
Status: Triaged => Fix Released
** Changed in: grub2-signed (Ubuntu Zesty)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/1401532
Title:
GRUB's Secure Boot implementation loads unsigned kernel without
warning
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