package grub-efi-amd64-signed 1.34.6+2.02~beta2-9ubuntu1.5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

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Stop with update.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: grub-efi-amd64-signed 1.34.6+2.02~beta2-9ubuntu1.5
ProcVersionSignature: Ubuntu 3.13.0-73.116-generic 3.13.11-ckt30
Uname: Linux 3.13.0-73-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
Date: Tue Dec 15 08:31:28 2015
DuplicateSignature: package:grub-efi-amd64-signed:1.34.6+2.02~beta2-9ubuntu1.5:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2015-05-02 (226 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.5
 apt 1.0.1ubuntu2.10
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.34.6+2.02~beta2-9ubuntu1.5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)