I also had this problem. I was upgrading from 16 LTS -> 18 LTS -> 20 LTS
sudo mv
/usr/share/dbus-1/system-services/org.freedesktop.systemd1.service{,.bak}
sudo apt purge systemd-shim
Do you want to continue? [Y/n] y
Abort.
(Not sure why that happened and I had to run it again to actually get it to
purge).
sudo apt-get update
sudo apt-get upgrade
(Software updater upgrade button does nothing...)
The following packages have been kept back:
python-oauthlib python-openssl
sudo apt-get remove python-oauthlib python-openssl
Then it worked from GUI
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https://bugs.launchpad.net/bugs/1773859
Title:
Upgrades to 18.04 fail due to systemd-shim
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