[Bug 1612652] 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 log shows that you were upgrading from version 1.12+0.8-0ubuntu2 of
shim-signed (in the xenial release pocket) to version
1.18~16.04.1+0.8-0ubuntu2 (in xenial-updates).

The error in your log is:

Setting up shim-signed (1.18~16.04.1+0.8-0ubuntu2) ...
Installing for x86_64-efi platform.
grub-install: error: cannot find EFI directory.
dpkg: error processing package shim-signed (--configure):
 subprocess installed post-installation script returned error exit status 1

You should have an EFI system partition mounted at /boot/efi, containing
your existing bootloader.

Please show the output of the 'mount' command on your system.

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

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Title:
  (16.04, installing updates, shim-signed installed but system is not
  UEFI) 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:
  None that I can add.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: shim-signed 1.18~16.04.1+0.8-0ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  BootEFIContents:
   fw
   fwupx64.efi
  Date: Fri Aug 12 22:57:02 2016
  DuplicateSignature:
   package:shim-signed:1.18~16.04.1+0.8-0ubuntu2
   Setting up grub-efi-amd64-signed (1.66.2+2.02~beta2-36ubuntu3.2) ...
   grub-install: error: /usr/lib/grub/i386-pc/modinfo.sh doesn't exist. Please specify --target or --directory.
   dpkg: error processing package grub-efi-amd64-signed (--configure):
    subprocess installed post-installation script returned error exit status 1
  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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