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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1788630/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs