package grub-efi-amd64-signed 1.66.21+2.02~beta2-36ubuntu3.21 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[ogresto]

heppens after parallel windows update

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: grub-efi-amd64-signed 1.66.21+2.02~beta2-36ubuntu3.21
ProcVersionSignature: Ubuntu 4.15.0-45.48~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-45-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
Date: Thu Apr 18 08:36:22 2019
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2017-03-13 (765 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.5
 apt 1.2.31
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.66.21+2.02~beta2-36ubuntu3.21 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)