This bug was fixed in the package grub2 - 2.02+dfsg1-5ubuntu10
---------------
grub2 (2.02+dfsg1-5ubuntu10) disco; urgency=medium
* debian/grub-check-signatures: check kernel signatures against keys known
in firmware, in case a kernel is signed but not using a key that will pass
validation, such as when using kernels coming from a PPA. (LP: #1789918)
-- Mathieu Trudel-Lapierre <[email protected]> Mon, 21 Jan 2019
09:34:36 -0500
** Changed in: grub2 (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1789918
Title:
grub2 signed kernel enforcement doesn't check on upgrade that
signatures are from trusted keys
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