[Bug 1603642] Re: (trusty, debconf passthrough) package shim-signed 1.17~14.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128

[Russell Jones]

The default is to disable secureboot. However, this requires a password
to be set. These defaults seem contradictory when used with
DEBIAN_FRONTEND=noninteractive. We use noninteractive mode (along with
some other options-- I'll be investigating further tomorrow) to install
systems, and the package gets stuck in an infinite loop. From the output
of apt-extracttemplates:

Template: shim/disable_secureboot
Type: boolean
Default: true
Description: Disable UEFI Secure Boot?
 If Secure Boot remains enabled on your system, your system may still boot but
 any hardware that requires third-party drivers to work correctly may not be
 usable.

Template: shim/enable_secureboot
Type: boolean
Default: false
Description: Enable UEFI Secure Boot?
 If Secure Boot is enabled on your system, your system may still boot but
 any hardware that requires third-party drivers to work correctly may not be
 usable.

Template: shim/secureboot_key
Type: string
Description: Enter a password for Secure Boot. It will be asked again after a reboot.

Template: shim/secureboot_key_again
Type: string
Description: Enter the same password again to verify you have typed it correctly.

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https://bugs.launchpad.net/bugs/1603642

Title:
  (trusty, debconf passthrough) package shim-signed
  1.17~14.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 128

Status in shim-signed package in Ubuntu:
  Confirmed

Bug description:
  Just after upgrade.

  ProblemType: Package
  DistroRelease: Ubuntu 14.04
  Package: shim-signed 1.17~14.04.1+0.8-0ubuntu2
  ProcVersionSignature: Ubuntu 3.19.0-65.73~14.04.1-generic 3.19.8-ckt22
  Uname: Linux 3.19.0-65-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  BootEFIContents:
   grub.cfg
   grubx64.efi
   MokManager.efi
   shimx64.efi
  Date: Thu Jul 14 16:28:46 2016
  DuplicateSignature: package:shim-signed:1.17~14.04.1+0.8-0ubuntu2:subprocess installed post-installation script returned error exit status 128
  ErrorMessage: subprocess installed post-installation script returned error exit status 128
  InstallationDate: Installed on 2015-10-02 (288 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  RelatedPackageVersions:
   dpkg 1.17.5ubuntu5.7
   apt  1.0.1ubuntu2.14
  SourcePackage: shim-signed
  Title: package shim-signed 1.17~14.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128
  UpgradeStatus: No upgrade log present (probably fresh install)

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