[Bug 1767091] Re: package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 30

[Steve Langasek]

Thank you for reporting this issue.

The shim-signed package, on upgrade, needs to prompt you in order to
make changes to the MokManager configuration in your firmware.  These
prompts are done over debconf.  'exit status 30' is an indicator that
something has failed in the debconf.

Looking at the code, it appears there is a bug in the handling of the
'back' button on the "enable secureboot" prompt that would cause this
error.

We will look into fixing this code.  In the meantime, if you were shown
this prompt it means you will need to complete the reconfiguration of
your firmware; I recommend that you run 'sudo dpkg --configure -a' to
complete this process.

** Changed in: shim-signed (Ubuntu)
       Status: Confirmed => Triaged

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Title:
  package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade:
  installed shim-signed package post-installation script subprocess
  returned error exit status 30

Status in shim-signed package in Ubuntu:
  Triaged

Bug description:
  during partial update from 17.10 to 18.04

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: shim-signed 1.34.9+13-0ubuntu2
  ProcVersionSignature: Ubuntu 4.13.0-38.43-generic 4.13.16
  Uname: Linux 4.13.0-38-generic x86_64
  .proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] Aucun fichier ou dossier de ce type: '/proc/sys/kernel/moksbstate_disabled'
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  Date: Thu Apr 26 11:31:05 2018
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-20160624-2
  ErrorMessage: installed shim-signed package post-installation script subprocess returned error exit status 30
  InstallationDate: Installed on 2018-03-26 (30 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
  MokSBStateRT: 6   0   0   0   1
  Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu2
   apt  1.6.1
  SecureBoot: 6   0   0   0   1
  SourcePackage: shim-signed
  Title: package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 30
  UpgradeStatus: No upgrade log present (probably fresh install)

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