package xtrkcad-common 1:5.1.0-1 failed to install/upgrade: trying to overwrite '/usr/share/xtrkcad/demos/dmadjend.xtr', which is also in package xtrkcad 1:5.1.0-1

[Anthony Davis]

I tried to install using the software installer, but it failed

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: xtrkcad-common 1:5.1.0-1
ProcVersionSignature: Ubuntu 4.15.0-30.32-generic 4.15.18
Uname: Linux 4.15.0-30-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
AptOrdering:
 xtrkcad-common:amd64: Install
 xtrkcad:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
Date: Sun Aug 12 19:42:58 2018
Dependencies:

DpkgTerminalLog:
 Preparing to unpack .../xtrkcad-common_1%3a5.1.0-1_all.deb ...
 Unpacking xtrkcad-common (1:5.1.0-1) ...
 dpkg: error processing archive /var/cache/apt/archives/xtrkcad-common_1%3a5.1.0-1_all.deb (--unpack):
  trying to overwrite '/usr/share/xtrkcad/demos/dmadjend.xtr', which is also in package xtrkcad 1:5.1.0-1
DuplicateSignature:
 package:xtrkcad-common:1:5.1.0-1
 Unpacking xtrkcad-common (1:5.1.0-1) ...
 dpkg: error processing archive /var/cache/apt/archives/xtrkcad-common_1%3a5.1.0-1_all.deb (--unpack):
  trying to overwrite '/usr/share/xtrkcad/demos/dmadjend.xtr', which is also in package xtrkcad 1:5.1.0-1
ErrorMessage: trying to overwrite '/usr/share/xtrkcad/demos/dmadjend.xtr', which is also in package xtrkcad 1:5.1.0-1
InstallationDate: Installed on 2018-06-12 (61 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3
SourcePackage: xtrkcad
Title: package xtrkcad-common 1:5.1.0-1 failed to install/upgrade: trying to overwrite '/usr/share/xtrkcad/demos/dmadjend.xtr', which is also in package xtrkcad 1:5.1.0-1
UpgradeStatus: No upgrade log present (probably fresh install)