[Bug 1571103] [NEW] Installing 16.04 beta over 12.04 grub install failed, package shim-signed 1.12+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Paul Cunnell]

Public bug reported:

Tried installing 16.04 beta 2 over my (old) 12.04 LTS - failed at the
last stage to install grub properly, then got this error when I
rebooted.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: shim-signed 1.12+0.8-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
Uname: Linux 4.4.0-18-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
BootEFIContents:
 fw
 fwupx64.efi
Date: Fri Apr 15 23:10:41 2016
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
 apt  1.2.7
SourcePackage: shim-signed
Title: package shim-signed 1.12+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)

** Affects: shim-signed (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package xenial

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https://bugs.launchpad.net/bugs/1571103

Title:
  Installing 16.04 beta over 12.04 grub install failed, package shim-
  signed 1.12+0.8-0ubuntu2 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 1

Status in shim-signed package in Ubuntu:
  New

Bug description:
  Tried installing 16.04 beta 2 over my (old) 12.04 LTS - failed at the
  last stage to install grub properly, then got this error when I
  rebooted.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: shim-signed 1.12+0.8-0ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  BootEFIContents:
   fw
   fwupx64.efi
  Date: Fri Apr 15 23:10:41 2016
  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
   apt  1.2.7
  SourcePackage: shim-signed
  Title: package shim-signed 1.12+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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