Thank you for the bug report. I tried to reproduce the problem but could not and I suspect it is caused by an other issue with the system.
In .var.log.apt.history.log.txt i see dpkg starting to fail earlier: ... Start-Date: 2019-01-15 10:10:08 Commandline: apt-get install apache2 Requested-By: lenovo (1000) Install: apache2:amd64 (2.4.29-1ubuntu4.5) Error: Sub-process /usr/bin/dpkg returned an error code (1) End-Date: 2019-01-15 10:10:23 ... If you have more information on how the issue can be reproduced on a clean system please share it in this bug report. ** Changed in: unattended-upgrades (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to unattended-upgrades in Ubuntu. https://bugs.launchpad.net/bugs/1811930 Title: package unattended-upgrades 1.1ubuntu1.18.04.8 failed to install/upgrade: installed unattended-upgrades package post- installation script subprocess returned error exit status 10 Status in unattended-upgrades package in Ubuntu: Incomplete Bug description: this error occoured while upgrade ProblemType: Package DistroRelease: Ubuntu 18.04 Package: unattended-upgrades 1.1ubuntu1.18.04.8 ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18 Uname: Linux 4.15.0-29-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.5 Architecture: amd64 Date: Wed Jan 16 11:53:24 2019 DuplicateSignature: package:unattended-upgrades:1.1ubuntu1.18.04.8 Setting up unattended-upgrades (1.1ubuntu1.18.04.8) ... dpkg: error processing package unattended-upgrades (--configure): installed unattended-upgrades package post-installation script subprocess returned error exit status 10 ErrorMessage: installed unattended-upgrades package post-installation script subprocess returned error exit status 10 InstallationDate: Installed on 2018-12-06 (40 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) PackageArchitecture: all Python3Details: /usr/bin/python3.6, Python 3.6.7, unpackaged PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, unpackaged RelatedPackageVersions: dpkg 1.19.0.5ubuntu2.1 apt 1.6.6 SourcePackage: unattended-upgrades Title: package unattended-upgrades 1.1ubuntu1.18.04.8 failed to install/upgrade: installed unattended-upgrades package post-installation script subprocess returned error exit status 10 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1811930/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp