package unattended-upgrades (not installed) failed to install/upgrade: subprocess installed post-removal script returned error exit status 1

[MUHAMMAD FAHEEM]

during startup i get this error.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: unattended-upgrades (not installed)
ProcVersionSignature: Ubuntu 4.15.0-47.50~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-47-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
AptOrdering:
 unattended-upgrades: Purge
 rsyslog: Configure
 NULL: ConfigurePending
Architecture: amd64
Date: Tue Apr 2 17:52:13 2019
ErrorMessage: subprocess installed post-removal script returned error exit status 1
InstallationDate: Installed on 2018-08-09 (238 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.5
 apt 1.2.31
SourcePackage: unattended-upgrades
Title: package unattended-upgrades (not installed) failed to install/upgrade: subprocess installed post-removal script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Balint Reczey (rbalint)]

https://answers.launchpad.net/ubuntu/+source/apt/+question/284708

Removing unattended-upgrades (0.90ubuntu0.10) ...
Purging configuration files for unattended-upgrades (0.90ubuntu0.10) ...
insserv: warning: script 'S99runmbbservice' missing LSB tags and overrides
insserv: warning: script 'runmbbservice' missing LSB tags and overrides
insserv: There is a loop between service plymouth and procps if started
insserv: loop involving service procps at depth 2
insserv: loop involving service udev at depth 1
insserv: There is a loop between service runmbbservice and hwclock if started
insserv: loop involving service hwclock at depth 1
insserv: loop involving service checkroot at depth 3
insserv: loop involving service mountdevsubfs at depth 1
insserv: There is a loop at service runmbbservice if started
insserv: There is a loop at service plymouth if started
insserv: loop involving service networking at depth 4
insserv: Starting runmbbservice depends on plymouth and therefore on system facility `$all' which ...
insserv: There is a loop between service runmbbservice and dns-clean if started
insserv: loop involving service dns-clean at depth 1
insserv: exiting now without changing boot order!
update-rc.d: error: insserv rejected the script header
dpkg: error processing package unattended-upgrades (--purge):
 subprocess installed post-removal script returned error exit status 1