[Bug 1608256] Re: package shim-signed 1.18~16.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Steve Langasek]

The error message indicates that shim-signed should not have been
installed on your system, because you are not running UEFI.  So it is of
great concern that something is trying to install shim-signed on your
system.

We have previously seen bugs we believe were caused by different parts
of the installer using different methods to detect whether UEFI was in
use, but in your case the installation of shim-signed did not happen at
install time.

Do you know why shim-signed was being installed on your system, or from
what package manager frontend?  The only information in your logs is:

Start-Date: 2016-07-31  18:41:47
Commandline: apt-get --no-upgrade -o Acquire::gpgv::Options::=--ignore-time-conflict -y install shim-signed
Install: shim-signed:amd64 (1.18~16.04.1+0.8-0ubuntu2), shim:amd64 (0.8-0ubuntu2, automatic)

and this doesn't really show what is triggering the install.

** Changed in: shim-signed (Ubuntu)
       Status: New => Incomplete

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Title:
  package shim-signed 1.18~16.04.1+0.8-0ubuntu2 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

Status in shim-signed package in Ubuntu:
  Incomplete

Bug description:
  During installation procedure error with grub was reported. No more
  action possible, although the window said 'close' and then proceed.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: shim-signed 1.18~16.04.1+0.8-0ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Uname: Linux 4.4.0-31-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  BootEFIContents:
   fw
   fwupx64.efi
  Date: Sun Jul 31 18:41:49 2016
  Df:
   Dateisystem    1K-Blöcke Benutzt Verfügbar Verw% Eingehängt auf
   /dev/sda1       44541744 8507556  33748628   21% /
   /dev/sdb1        3923456 1476984   2446472   38% /cdrom
   udev             4004768       0   4004768    0% /dev
   tmpfs             803880    9460    794420    2% /run
  EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: efibootmgr: EFI variables are not supported on this system.
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.1
   apt  1.2.12~ubuntu16.04.1
  SourcePackage: shim-signed
  Title: package shim-signed 1.18~16.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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