package unattended-upgrades 0.90ubuntu0.6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[marc.cryan]

package unattended-upgrades 0.90ubuntu0.6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

happened after update to 16

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: unattended-upgrades 0.90ubuntu0.6
ProcVersionSignature: Ubuntu 3.13.0-121.170-generic 3.13.11-ckt39
Uname: Linux 3.13.0-121-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.6
Architecture: amd64
Date: Sat Jun 24 23:29:06 2017
DuplicateSignature:
 package:unattended-upgrades:0.90ubuntu0.6
 Installing new version of config file /etc/logrotate.d/unattended-upgrades ...
 dpkg: error processing package unattended-upgrades (--configure):
  subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2014-12-12 (925 days ago)
InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.20
SourcePackage: unattended-upgrades
Title: package unattended-upgrades 0.90ubuntu0.6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2017-06-25 (0 days ago)
mtime.conffile..etc.apt.apt.conf.d.50unattended-upgrades: 2017-06-25T00:51:54.028358

[Launchpad Janitor (janitor)]

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