[Bug 1788630] Re: 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

[Leonardo Müller]

My problem is with the wireless card QCA9377. It has a 50% boot success
rate. One time it boots, the next time it fails. On my case, I'm able
to, say, install Ubuntu successfully, but after shutting the computer
down and booting it again it would fail, so there is a window to act.

Unfortunately I have found no way to work around this issue, the only
solution being to install the mainline kernel. I have helped to
investigate, even bisected the kernel, but the patch alone was not
enough, as it seems the problem is complex and correctable only with
many patches.

After the r8169 bug I reported that was fixed to me but create an
enormous regression to other users, I feel uneasy of asking to fix bugs
I'm having, as they could introduce serious regressions to other users.

I already use many boot parameters, mainly to enable functionalities I
desire, not to work around bugs, fortunately. I use:

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

As I want to use Intel GVT-g, cgroups and hibernation. There are options
to ath10k, but found none that worked to me.

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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

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  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)

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