package systemd-sysv 237-3ubuntu10.3 failed to install/upgrade: installed systemd-shim package post-removal script subprocess returned error exit status 2

[Colin Belton]

During upgrade received following errors:
1. installed systemd-shim package post-removal script subprocess returned error exit status 2
2. could not install '/var/cache/apt/archives/systemd-sysv_237-3ubuntu10.3_amd64.deb
3. Could not install upgrades - The upgrade has aborted your system could be in an unusable state. A recovery will run now (dpkg -configure -a)
4. The upgrade has completed but there were errors during the upgrade process
5. lsb_release -a resulted in Ubuntu 18.04.1 LTS

Then no GUI when boot
So did:
sudo apt purge gdm gdm3
sudo apt install gdm3 ubuntu-desktop
systemctl restart gdm

And received:
The system is runnin in low graphics mode.....
But still no GUI

Then did:
sudo apt-get install lightdm
sudo dpkg-reconfigure lightdm

And then got a working GUI.
Then followed errors and request for bug report

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: systemd-sysv 237-3ubuntu10.3
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
Date: Sat Sep 22 11:19:55 2018
ErrorMessage: installed systemd-shim package post-removal script subprocess returned error exit status 2
InstallationDate: Installed on 2013-04-01 (1999 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3ubuntu0.1
SourcePackage: systemd
Title: package systemd-sysv 237-3ubuntu10.3 failed to install/upgrade: installed systemd-shim package post-removal script subprocess returned error exit status 2
UpgradeStatus: Upgraded to bionic on 2018-09-22 (0 days ago)

[Brian Murray (brian-murray)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1773859, so it 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.