This bug was fixed in the package grub2-signed - 1.34.20
---------------
grub2-signed (1.34.20) trusty; urgency=medium
* Run grub-check-signatures before running grub-install, to block upgrade if
no signed kernels are installed. (LP: #1789918)
grub2-signed (1.34.19) trusty; urgency=medium
* Rebuild against grub-efi-amd64 2.02~beta2-9ubuntu1.17
(LP: #1401532) (LP: #1789918)
-- Mathieu Trudel-Lapierre <[email protected]> Mon, 01 Apr 2019
12:03:07 -0400
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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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