package libperl5.20 5.20.2-2ubuntu0.1 failed to install/upgrade: package libperl5.20 is already installed and configured

[mjn]

error report popped up

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: libperl5.20 5.20.2-2ubuntu0.1
ProcVersionSignature: Ubuntu 3.19.0-43.49-generic 3.19.8-ckt10
Uname: Linux 3.19.0-43-generic i686
ApportVersion: 2.17.2-0ubuntu1.7
AptOrdering:
 perl-modules: Install
 perl-modules: Configure
 perl: Configure
 libperl5.20: Configure
 NULL: ConfigurePending
AptdaemonVersion: 1.1.1+bzr982-0ubuntu3.1
Architecture: i386
Date: Sat Feb 13 11:11:07 2016
DpkgHistoryLog:
 Start-Date: 2016-02-13 11:10:23
 Commandline: aptdaemon role='role-fix-broken-depends' sender=':1.75'
 Upgrade: perl-modules:i386 (5.20.2-2, 5.20.2-2ubuntu0.1)
DuplicateSignature: package:libperl5.20:5.20.2-2ubuntu0.1:package libperl5.20 is already installed and configured
ErrorMessage: package libperl5.20 is already installed and configured
InstallationDate: Installed on 2015-10-17 (119 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release i386 (20150422)
RelatedPackageVersions:
 dpkg 1.17.25ubuntu1.1
 apt 1.0.9.7ubuntu4.1
SourcePackage: perl
Title: package libperl5.20 5.20.2-2ubuntu0.1 failed to install/upgrade: package libperl5.20 is already installed and configured
UpgradeStatus: No upgrade log present (probably fresh install)