These lines look like the important ones from the logs:
/boot/vmlinuz-4.15.0-1024-oem.efi.signed is signed, but using an unknown key:
Subject: CN = PPA canonical-kernel-team ppa
E: Your kernels are not signed with a key known to your firmware. This system
will fail to boot in a Secure Boot environment.
dpkg: error processing package grub-efi-amd64 (--configure):
installed grub-efi-amd64 package post-installation script subprocess returned
error exit status 1
Thanks
** Also affects: linux-signed-oem (Ubuntu)
Importance: Undecided
Status: New
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Packages, which is subscribed to linux-signed-oem in Ubuntu.
https://bugs.launchpad.net/bugs/1845861
Title:
package grub-efi-amd64 2.02-2ubuntu8.13 failed to install/upgrade:
installed grub-efi-amd64 package post-installation script subprocess
returned error exit status 1
Status in grub2 package in Ubuntu:
New
Status in linux-signed-oem package in Ubuntu:
New
Bug description:
package grub-efi-amd64 2.02-2ubuntu8.13 failed to install/upgrade:
installed grub-efi-amd64 package post-installation script subprocess
returned error exit status 1
ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-efi-amd64 2.02-2ubuntu8.13
ProcVersionSignature: Ubuntu 4.15.0-1024.29-oem 4.15.18
Uname: Linux 4.15.0-1024-oem x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
Date: Sun Sep 29 12:12:06 2019
DistributionChannelDescriptor:
# This is the distribution channel descriptor for the OEM CDs
# For more information see
http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-somerville-bionic-amd64-20180608-47+loki-n3-v3-whl+X32+loki-n3+X00
ErrorMessage: installed grub-efi-amd64 package post-installation script
subprocess returned error exit status 1
InstallationDate: Installed on 2019-09-29 (0 days ago)
InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary
20180608-09:38
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-1024-oem.efi.signed
root=UUID=5b8500c1-09d2-4cc8-804e-1acd636a7293 ro mem_sleep_default=deep
usbcore.quirks=2386:3119:k quiet splash vt.handoff=1
Python3Details: /usr/bin/python3.6, Python 3.6.8, python3-minimal,
3.6.7-1~18.04
PythonDetails: /usr/bin/python2.7, Python 2.7.15+, python-minimal,
2.7.15~rc1-1
RelatedPackageVersions:
dpkg 1.19.0.5ubuntu2.3
apt 1.6.12
SourcePackage: grub2
Title: package grub-efi-amd64 2.02-2ubuntu8.13 failed to install/upgrade:
installed grub-efi-amd64 package post-installation script subprocess returned
error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)
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