package virtualbox-dkms 5.2.10-dfsg-2 failed to install/upgrade: Unterprozess installed virtualbox-dkms package post-installation script gab den Fehler-Ausgangsstatus 1 zurück

[Sebastian Scala]

error when upgrading virtualbox-dkms

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: virtualbox-dkms 5.2.10-dfsg-2
ProcVersionSignature: Ubuntu 4.15.0-17.18-generic 4.15.17
Uname: Linux 4.15.0-17-generic x86_64
ApportVersion: 2.20.9-0ubuntu5
Architecture: amd64
Date: Fri Apr 20 07:48:54 2018
ErrorMessage: Unterprozess installed virtualbox-dkms package post-installation script gab den Fehler-Ausgangsstatus 1 zurück
InstallationDate: Installed on 2018-02-28 (50 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180227)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6
SourcePackage: virtualbox
Title: package virtualbox-dkms 5.2.10-dfsg-2 failed to install/upgrade: Unterprozess installed virtualbox-dkms package post-installation script gab den Fehler-Ausgangsstatus 1 zurück
UpgradeStatus: No upgrade log present (probably fresh install)

[Gianfranco Costamagna (costamagnagianfranco)]

- SSL error:02001002:system library:fopen:No such file or directory: ../crypto/bio/bss_file.c:74
- SSL error:2006D080:BIO routines:BIO_new_file:no such file: ../crypto/bio/bss_file.c:81
kmodsign: /var/lib/shim-signed/mok/MOK.priv: No such file or directory

you don't have the required private key?