Comment 0 for bug 1778800

update did not install.
a similar thing has happened with several apps have tried to download and the OS wont install them for some reason.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: unattended-upgrades 1.1ubuntu1.18.04.1
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
NonfreeKernelModules: nvidia wl
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Tue Jun 26 22:26:14 2018
ErrorMessage: installed unattended-upgrades package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2018-06-08 (18 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.1
SourcePackage: unattended-upgrades
Title: package unattended-upgrades 1.1ubuntu1.18.04.1 failed to install/upgrade: installed unattended-upgrades package post-installation script subprocess returned error exit status 1
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 "1";
mtime.conffile..etc.apt.apt.conf.d.10periodic: 2018-06-09T09:48:10.967920