package libreadline6:i386 (not installed) failed to install/upgrade: no package named 'libreadline6:i386' is installed, cannot configure

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ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libreadline6:i386 (not installed)
ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40
Uname: Linux 4.4.0-62-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
Date: Tue Feb 14 22:00:56 2017
DuplicateSignature:
 package:libreadline6:i386:(not installed)
 Processing triggers for libglib2.0-0:i386 (2.48.2-0ubuntu1) ...
 dpkg: error processing package libreadline6:i386 (--configure):
  no package named 'libreadline6:i386' is installed, cannot configure
ErrorMessage: no package named 'libreadline6:i386' is installed, cannot configure
InstallationDate: Installed on 2016-05-17 (273 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.19
SourcePackage: readline6
Title: package libreadline6:i386 (not installed) failed to install/upgrade: no package named 'libreadline6:i386' is installed, cannot configure
UpgradeStatus: No upgrade log present (probably fresh install)