package sendmail-base 8.15.2-11 failed to install/upgrade: installed sendmail-base package post-installation script subprocess returned error exit status 255

[Amandeep Singh]

package sendmail-base 8.15.2-11 failed to install/upgrade: installed sendmail-base package post-installation script subprocess returned error exit status 255

ProblemType: Package
DistroRelease: Ubuntu 18.10
Package: sendmail-base 8.15.2-11
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
Date: Mon Oct 22 20:50:04 2018
ErrorMessage: installed sendmail-base package post-installation script subprocess returned error exit status 255
InstallationDate: Installed on 2017-01-05 (654 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.7rc1, python3-minimal, 3.6.6-1
PythonDetails: /usr/bin/python2.7, Python 2.7.15+, python-minimal, 2.7.15-3
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu5
 apt 1.7.0
SourcePackage: sendmail
Title: package sendmail-base 8.15.2-11 failed to install/upgrade: installed sendmail-base package post-installation script subprocess returned error exit status 255
UpgradeStatus: Upgraded to cosmic on 2018-10-22 (0 days ago)

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1798964, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.