package mono-xsp4 4.2-2.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

Using Mono XSP 4 port: 8084
Binding Mono XSP 4 address: 0.0.0.0
Use of uninitialized value $libs in concatenation (.) or string at /usr/sbin/mono-xsp4-update line 216.

cannot fully install or purge mono-complete. essentially renderings the apt upgrade process completely broken

ProblemType: Package
DistroRelease: Ubuntu 17.10
Package: mono-xsp4 4.2-2.1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.1
AptOrdering:
 mono-complete:amd64: Purge
 NULL: ConfigurePending
 NULL: PurgePending
 NULL: ConfigurePending
Architecture: amd64
Date: Fri Nov 3 22:17:46 2017
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2017-10-19 (14 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
PackageArchitecture: all
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: xsp
Title: package mono-xsp4 4.2-2.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)