package default-jdk-headless 2:1.8-56ubuntu2 failed to install/upgrade: package default-jdk-headless is already installed and configured

[J Marta]

Description: Ubuntu 16.04.2 LTS
Release: 16.04

apt-cache policy pkgname
N: Unable to locate package pkgname

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: default-jdk-headless 2:1.8-56ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-79.100-generic 4.4.67
Uname: Linux 4.4.0-79-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.6
AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
Architecture: amd64
Date: Fri Jun 9 11:55:06 2017
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-xenial-amd64-20160624-2
DuplicateSignature:
 package:default-jdk-headless:2:1.8-56ubuntu2
 Removing obsolete dictionary files:
 dpkg: error processing package default-jre-headless (--configure):
  package default-jre-headless is already installed and configured
ErrorMessage: package default-jdk-headless is already installed and configured
InstallationDate: Installed on 2017-03-09 (97 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.20
SourcePackage: dpkg
Title: package default-jdk-headless 2:1.8-56ubuntu2 failed to install/upgrade: package default-jdk-headless is already installed and configured
UpgradeStatus: No upgrade log present (probably fresh install)

[Brian Murray (brian-murray)]

Due to a bug in apport's method for creating a duplicate signature, the DuplicateSignature in this report was incorrect. We are fixing that now, sorry for the noise!