package unattended-upgrades 0.90ubuntu0.9 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128

[Fland]

package unattended-upgrades 0.90ubuntu0.9 failed to install/upgrade: subprocess installed post-installation
no script returned error exit (status unknown). Just stopped
"debconf" opened and when I close it : "it seems you have modified the content of "/etc/apt/apt.conf.d/10periodic"

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: unattended-upgrades 0.90ubuntu0.9
ProcVersionSignature: Ubuntu 4.10.0-28.32~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
Date: Tue Feb 27 11:33:37 2018
ErrorMessage: subprocess installed post-installation script returned error exit status 128
InstallationDate: Installed on 2018-02-26 (0 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.3
 apt 1.2.25
SourcePackage: unattended-upgrades
Title: package unattended-upgrades 0.90ubuntu0.9 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128
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: 2018-02-26T23:42:00.409854

[Launchpad Janitor (janitor)]

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