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 address hidden> Mon, 21 Jan 2019 09:34:36 -0500
This bug was fixed in the package grub2 - 2.02+dfsg1- 5ubuntu10
--------------- 5ubuntu10) disco; urgency=medium
grub2 (2.02+dfsg1-
* 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 address hidden> Mon, 21 Jan 2019 09:34:36 -0500