package shim-signed 1.8+0.7-0ubuntu4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[John Jeffers]

Acer aspire V will not install until after you tell the firmware to ignore security in EFI then add the shim to the approved booting images list in the bootloader.

Model Acer Aspire V5-561P-6869 Latest Bios, Windows 8.1 upgraded with fastboot turned off. Followed instruction all the way.

Clearly the BIOS is unaware of anything except Windows.

15.04 installed from DVD checksum correct and Media checked.

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: shim-signed 1.8+0.7-0ubuntu4
ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8
Uname: Linux 3.19.0-21-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
Date: Tue Jun 16 23:12:21 2015
ErrorMessage: subprocess installed post-installation script returned error exit status 1
RelatedPackageVersions:
 dpkg 1.17.25ubuntu1
 apt 1.0.9.7ubuntu4
SourcePackage: shim-signed
Title: package shim-signed 1.8+0.7-0ubuntu4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Steve Langasek (vorlon)]

Please attach the files /sys/firmware/efi/vars/db-d719b2cb-3d3a-4596-a3bc-dad00e67656f/data, /sys/firmware/efi/vars/KEK-8be4df61-93ca-11d2-aa0d-00e098032b8c/data, and /sys/firmware/efi/vars/dbx-d719b2cb-3d3a-4596-a3bc-dad00e67656f/data to this bug report.