package virtualbox-ext-pack 5.2.10-3ubuntu18.04.1 failed to install/upgrade: installed virtualbox-ext-pack package post-installation script subprocess returned error exit status 4

[linuxpete]

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ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: virtualbox-ext-pack 5.2.10-3ubuntu18.04.1
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Fri Aug 3 11:25:40 2018
ErrorMessage: installed virtualbox-ext-pack package post-installation script subprocess returned error exit status 4
InstallationDate: Installed on 2018-02-14 (171 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3
SourcePackage: virtualbox-ext-pack
Title: package virtualbox-ext-pack 5.2.10-3ubuntu18.04.1 failed to install/upgrade: installed virtualbox-ext-pack package post-installation script subprocess returned error exit status 4
UpgradeStatus: Upgraded to bionic on 2018-08-03 (1 days ago)