package libapt-pkg5.0:amd64 1.2.18 failed to install/upgrade: package libapt-pkg5.0:amd64 is already installed and configured

[vincegillard]

Adding extra desktops to Kubuntu 16.04. Unable to log in under LXDE.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libapt-pkg5.0:amd64 1.2.18
ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
Uname: Linux 4.4.0-59-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.4
AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
Architecture: amd64
Date: Thu Jan 12 00:16:32 2017
DuplicateSignature:
 package:libapt-pkg5.0:amd64:1.2.18
 Processing triggers for man-db (2.7.5-1) ...
 dpkg: error processing package libapt-pkg5.0:amd64 (--configure):
  package libapt-pkg5.0:amd64 is already installed and configured
ErrorMessage: package libapt-pkg5.0:amd64 is already installed and configured
InstallationDate: Installed on 2016-12-30 (17 days ago)
InstallationMedia: Kubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.18
SourcePackage: dpkg
Title: package libapt-pkg5.0:amd64 1.2.18 failed to install/upgrade: package libapt-pkg5.0:amd64 is already installed and configured
UpgradeStatus: No upgrade log present (probably fresh install)