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During an upgrade from 16.04 to 18.04 I got 4 error messages or warnings. The upgrade seemed to complete and the system now boots and runs ok but I am now unable to run any package updates. The error messages during the upgrade were:
systemd-shim package not installed post removal script subprocess returned error exit status 2/var/cache/apt/archives/systemd_237-3ubuntu10.39_amd64.deb post removal script subprocess returned error exit status 2systemd-sysv_237-3ubuntu10.39_amd64.deb post removal script subprocess returned error exit status 2The upgrade was aborted. Your system could be in an unstable state. A recovery will now run (dpkg -configure -a)

But it seems like the upgrade was not aborted because the System Information now shows the OS to be Ubuntu 18.04.4 LTS.

Now when I run Software Updater I get this message:
Not all updates can be installed. Run a partial upgrade to install as many updates as possible
There are two buttons: Partial Upgrade and Continue.

If I click Continue I get this:
Software Index is broken. It is impossible to install or remove any software right now. Please use Synaptic or sudo apt-get install -f to fix this issue.
If I then run Synaptic the package systemd-shim is marked to be removed. When I then click Apply I get:
Error systemd-shim. installed systemd-shim package post removal script subprocess returned error exit status 2

If I click Partial Upgrade in the Software Updater it starts to go through the process but I then get:
Could not install systemd-shim
I click Close and other upgrades seem to continue, then right at the end I get:
Could not install the upgrades. The upgrade has aborted. A recovery will now run (dpkg -configure -a). The upgrade has completed but there were errors.

I'd be very grateful for any suggestions to get me out of this situation.

10-21-2020, 10:11 AM
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