package unattended-upgrades 0.90ubuntu0.5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 29

[Neolite]

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ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: unattended-upgrades 0.90ubuntu0.5
ProcVersionSignature: Ubuntu 4.8.0-51.54~16.04.1-generic 4.8.17
Uname: Linux 4.8.0-51-generic x86_64
.var.log.unattended-upgrades.unattended-upgrades.log:

ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
Date: Wed May 10 11:25:10 2017
DuplicateSignature:
 package:unattended-upgrades:0.90ubuntu0.5
 Setting up flashplugin-installer (25.0.0.171ubuntu0.16.04.1) ...
 Can't locate object method "new" via package "Text::Iconv" (perhaps you forgot to load "Text::Iconv"?) at /usr/lib/perl5/5.22.1/Debconf/Encoding.pm line 65.
 dpkg: error processing package flashplugin-installer (--configure):
  subprocess installed post-installation script returned error exit status 29
ErrorMessage: subprocess installed post-installation script returned error exit status 29
InstallationDate: Installed on 2017-04-01 (39 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.20
SourcePackage: unattended-upgrades
Title: package unattended-upgrades 0.90ubuntu0.5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 29
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.apt.apt.conf.d.10periodic:
 APT::Periodic::Update-Package-Lists "1";
 APT::Periodic::Download-Upgradeable-Packages "0";
 APT::Periodic::AutocleanInterval "0";
 APT::Periodic::Unattended-Upgrade "0";
mtime.conffile..etc.apt.apt.conf.d.10periodic: 2017-04-01T21:54:17.006906

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.