package grub-efi-amd64-signed 1.34.8+2.02~beta2-9ubuntu1.7 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Julius_Haensch]

I have a multi boot system with Ubuntu 14.04.3 , windows 10, windows 8.1. The error ocurred installing software update on January 08, 2016

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: grub-efi-amd64-signed 1.34.8+2.02~beta2-9ubuntu1.7
ProcVersionSignature: Ubuntu 3.16.0-57.77~14.04.1-generic 3.16.7-ckt20
Uname: Linux 3.16.0-57-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
Date: Fri Jan 8 09:13:28 2016
DuplicateSignature: package:grub-efi-amd64-signed:1.34.8+2.02~beta2-9ubuntu1.7:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2015-07-02 (189 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.5
 apt 1.0.1ubuntu2.10
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.34.8+2.02~beta2-9ubuntu1.7 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.