package xrdp 0.9.9-1 failed to install/upgrade: installed xrdp package post-installation script subprocess returned error exit status 1

[Robert Collins]

Install was in a hyperV vm.

ProblemType: Package
DistroRelease: Ubuntu 19.10
Package: xrdp 0.9.9-1
ProcVersionSignature: Ubuntu 4.15.0-76.86-generic 4.15.18
Uname: Linux 4.15.0-76-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
Date: Sat Feb 8 08:41:55 2020
DuplicateSignature:
 package:xrdp:0.9.9-1
 Installing new version of config file /etc/xrdp/xrdp_keyboard.ini ...
 ln: failed to create symbolic link '/etc/xrdp/cert.pem': File exists
 dpkg: error processing package xrdp (--configure):
  installed xrdp package post-installation script subprocess returned error exit status 1
ErrorMessage: installed xrdp package post-installation script subprocess returned error exit status 1
Python3Details: /usr/bin/python3.7, Python 3.7.5, python3-minimal, 3.7.5-1
PythonDetails: /usr/bin/python2.7, Python 2.7.17, python-minimal, 2.7.17-1
RelatedPackageVersions:
 dpkg 1.19.7ubuntu2
 apt 1.9.4
SourcePackage: xrdp
Title: package xrdp 0.9.9-1 failed to install/upgrade: installed xrdp package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to eoan on 2020-02-08 (0 days ago)