package grub-efi-amd64-signed 1.55.2+2.02~beta2-29ubuntu0.2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Bernard Bondos]

problem occured when duing apt-get dist-upgrade few days after fresh install.

ProblemType: Package
DistroRelease: Ubuntu 15.10
Package: grub-efi-amd64-signed 1.55.2+2.02~beta2-29ubuntu0.2
ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6
Uname: Linux 4.2.0-22-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
Date: Sat Jan 9 19:15:20 2016
DuplicateSignature: package:grub-efi-amd64-signed:1.55.2+2.02~beta2-29ubuntu0.2:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2015-11-21 (48 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
RelatedPackageVersions:
 dpkg 1.18.2ubuntu5.1
 apt 1.0.10.2ubuntu1
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.55.2+2.02~beta2-29ubuntu0.2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)