package dpkg 1.18.4ubuntu1.2 failed to install/upgrade: package dpkg is already installed and configured

[Ton Sonneveldt]

Tried to install keepassx-elopio package and got this "bugg"message that it could not be installed as there was a problem with dpkg

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: dpkg 1.18.4ubuntu1.2
ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
Uname: Linux 4.8.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.6
AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
Architecture: amd64
CrashReports:
 640:0:116:386657:2017-05-26 00:41:25.585286855 +0200:2017-05-26 00:41:26.585286855 +0200:/var/crash/_usr_lib_snapd-glib_snapd-login-service.0.crash
 644:0:116:0:2017-05-26 00:41:26.993285139 +0200:2017-05-26 00:41:26.993285139 +0200:/var/crash/_usr_lib_snapd-glib_snapd-login-service.0.upload
 640:0:116:213918:2017-05-26 00:06:22.347523927 +0200:2017-05-26 00:06:23.347523927 +0200:/var/crash/dpkg.0.crash
Date: Fri May 26 00:06:22 2017
DpkgTerminalLog:
 dpkg: error processing package dpkg (--configure):
  package dpkg is already installed and configured
ErrorMessage: package dpkg is already installed and configured
InstallationDate: Installed on 2017-05-25 (0 days ago)
InstallationMedia: Xubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.20
SourcePackage: dpkg
Title: package dpkg 1.18.4ubuntu1.2 failed to install/upgrade: package dpkg is already installed and configured
UpgradeStatus: No upgrade log present (probably fresh install)