Public bug reported:
On the update of grub-efi-amd64, it's now warning about unsigned
kernels, which it was not doing before, and failing. However, before
this update, the unsigned kernels were booting properly with Secure Boot
enabled. I don't know what would make them unbootable now. The following
message appears on upgrade:
┌───────────────────────────┤ unsigned kernels ├────────────────────────────┐
│ │
│ Cannot upgrade Secure Boot enforcement policy due to unsigned kernels │
│ │
│ Your system has UEFI Secure Boot enabled in firmware, and the following │
│ kernels present on your system are unsigned: │
│ │
│ 4.17.18-041718-lowlatency │
│ 4.17.17-041717-lowlatency │
│ │
│ │
│ These kernels cannot be verified under Secure Boot. To ensure your │
│ system remains bootable, GRUB will not be upgraded on your disk until │
│ these kernels are removed or replaced with signed kernels. │
Using the Ubuntu's default kernel is not an option to me, as it has bugs
that weren't solved and make my notebook fail to boot.
ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-efi-amd64 2.02-2ubuntu8.3
Uname: Linux 4.17.17-041717-lowlatency x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Thu Aug 23 11:30:50 2018
ErrorMessage: installed grub-efi-amd64 package post-installation script
subprocess returned error exit status 1
InstallationDate: Installed on 2017-06-13 (435 days ago)
InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
InvalidGrubScript: /etc/grub.d/40_custom
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.17.17-041717-lowlatency
root=UUID=6b4ae5c0-c78c-49a6-a1ba-029192618a7a ro quiet kvm.ignore_msrs=1
kvm.halt_poll_ns=0 kvm.halt_poll_ns_grow=0 intel_iommu=on iommu=pt
i915.enable_gvt=1 resume=UUID=0946602f-3ca2-4379-9012-7a5171928de7 ro
mtrr_gran_size=2M mtrr_chunk_size=64M cgroup_enable=memory swapaccount=1
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal,
3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal,
2.7.15~rc1-1
RelatedPackageVersions:
dpkg 1.19.0.5ubuntu2
apt 1.6.3ubuntu0.1
SourcePackage: grub2
Title: package grub-efi-amd64 2.02-2ubuntu8.3 failed to install/upgrade:
installed grub-efi-amd64 package post-installation script subprocess returned
error exit status 1
UpgradeStatus: Upgraded to bionic on 2017-10-20 (307 days ago)
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-package bionic
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https://bugs.launchpad.net/bugs/1788630
Title:
package grub-efi-amd64 2.02-2ubuntu8.3 failed to install/upgrade:
installed grub-efi-amd64 package post-installation script subprocess
returned error exit status 1
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