package network-manager-openvpn 1.2.10-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 100

[Herbert Post]

Happens when installing networkmanager-openvpn-gnome

ProblemType: Package
DistroRelease: Ubuntu 17.10
Package: network-manager-openvpn 1.2.10-0ubuntu2
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
Date: Wed Oct 25 17:11:52 2017
DuplicateSignature:
 package:network-manager-openvpn:1.2.10-0ubuntu2
 Setting up network-manager-openvpn (1.2.10-0ubuntu2) ...
 E: Option nm-openvpn: Configuration item specification must have an =<val>.
 dpkg: error processing package network-manager-openvpn (--configure):
  subprocess installed post-installation script returned error exit status 100
ErrorMessage: subprocess installed post-installation script returned error exit status 100
InstallationDate: Installed on 2017-09-17 (38 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170917)
Python3Details: /usr/bin/python3.6, Python 3.6.3, python3-minimal, 3.6.3-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.14, python-minimal, 2.7.14-2ubuntu1
RelatedPackageVersions:
 dpkg 1.18.24ubuntu1
 apt 1.5
SourcePackage: network-manager-openvpn
Title: package network-manager-openvpn 1.2.10-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 100
UpgradeStatus: No upgrade log present (probably fresh install)

[Herbert Post (roberine)]

Tried this on a second computer. Same results. Even though OpenVPN is working regardless of error.
Error now keeps popping up in every "apt update".

[Herbert Post (roberine)]

After clean install the problem has not appeared.
openvpn installed without a problem.