package isdnlog 1:3.25+dfsg1-3.7ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

isdnutils-base.service
   Loaded: loaded (/etc/init.d/isdnutils-base; bad; vendor preset: enabled)
   Active: active (exited) (Result: exit-code) since Thu 2016-06-30 16:01:41 BST; 6min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 5180 ExecReload=/etc/init.d/isdnutils-base reload (code=exited, status=1/FAILURE)

Jun 30 16:02:49 jeremy-700Z3A-700Z4A-700Z5A-700Z5B isdnutils-base[3733]: * Sorry, reload can only be done explicitly for ipppd and isdnlog.
Jun 30 16:02:49 jeremy-700Z3A-700Z4A-700Z5A-700Z5B isdnutils-base[3733]: * Run "/etc/init.d/isdnutils-base reload ipppd" for example.
Jun 30 16:02:49 jeremy-700Z3A-700Z4A-700Z5A-700Z5B systemd[1]: isdnutils-base.service: Control process exited, code=exited status=1
Jun 30 16:02:49 jeremy-700Z3A-700Z4A-700Z5A-700Z5B systemd[1]: Reload failed for isdnutils-base.service.
Jun 30 16:06:28 jeremy-700Z3A-700Z4A-700Z5A-700Z5B systemd[1]: Started isdnutils-base.service.
Jun 30 16:06:28 jeremy-700Z3A-700Z4A-700Z5A-700Z5B systemd[1]: Reloading isdnutils-base.service.
Jun 30 16:06:28 jeremy-700Z3A-700Z4A-700Z5A-700Z5B isdnutils-base[5180]: * Sorry, reload can only be done explicitly for ipppd and isdnlog.
Jun 30 16:06:28 jeremy-700Z3A-700Z4A-700Z5A-700Z5B isdnutils-base[5180]: * Run "/etc/init.d/isdnutils-base reload ipppd" for example.
Jun 30 16:06:28 jeremy-700Z3A-700Z4A-700Z5A-700Z5B systemd[1]: isdnutils-base.service: Control process exited, code=exited status=1
Jun 30 16:06:28 jeremy-700Z3A-700Z4A-700Z5A-700Z5B systemd[1]: Reload failed for isdnutils-base.service.

Jun 30 16:06:28 jeremy-700Z3A-700Z4A-700Z5A-700Z5B systemd[1]: Reloading isdnutils-base.service.
-- Subject: Unit isdnutils-base.service has begun reloading its configuration
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit isdnutils-base.service has begun reloading its configuration
Jun 30 16:06:28 jeremy-700Z3A-700Z4A-700Z5A-700Z5B isdnutils-base[5180]: * Sorry, reload can only be done explicitly for ipppd and isdnlog.
Jun 30 16:06:28 jeremy-700Z3A-700Z4A-700Z5A-700Z5B isdnutils-base[5180]: * Run "/etc/init.d/isdnutils-base reload ipppd" for example.
Jun 30 16:06:28 jeremy-700Z3A-700Z4A-700Z5A-700Z5B systemd[1]: isdnutils-base.service: Control process exited, code=exited status=1
Jun 30 16:06:28 jeremy-700Z3A-700Z4A-700Z5A-700Z5B systemd[1]: Reload failed for isdnutils-base.service.
-- Subject: Unit isdnutils-base.service has finished reloading its configuration
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit isdnutils-base.service has finished reloading its configuration
--
-- The result is failed.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: isdnlog 1:3.25+dfsg1-3.7ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Thu Jun 30 16:02:50 2016
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2016-05-30 (31 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: isdnutils
Title: package isdnlog 1:3.25+dfsg1-3.7ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)