package xrdp 0.9.5-2 failed to install/upgrade: installed xrdp package post-installation script subprocess returned error exit status 1

error when install xrdp

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: xrdp 0.9.5-2
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.3
AptOrdering:
 xorgxrdp:amd64: Install
 xrdp:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
Date: Thu Aug 23 16:51:24 2018
ErrorMessage: installed xrdp package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2018-08-21 (1 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3ubuntu0.1
SourcePackage: xrdp
Title: package xrdp 0.9.5-2 failed to install/upgrade: installed xrdp package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)