Upgrade from 16.04 lts to 18.04 lts ended up:
(Reading database ... 94306 files and directories currently installed.) Removing systemd-shim (9-1bzr4ubuntu1) ... Removing 'diversion of /usr/share/dbus-1/system-services/org.freedesktop.systemd1.service to /usr/share/dbus-1/system-services/org.freedesktop.systemd1.service.systemd by systemd-shim' dpkg-divert: error: rename involves overwriting '/usr/share/dbus-1/system-services/org.freedesktop.systemd1.service' with different file '/usr/share/dbus-1/system-services/org.freedesktop.systemd1.service.systemd', not allowed dpkg: error processing package systemd-shim (--remove): installed systemd-shim package post-removal script subprocess returned error exit status 2 Errors were encountered while processing: systemd-shim E: Sub-process /usr/bin/dpkg returned an error code (1) root@profistat:/var/log/dist-upgrade# sudo nano /etc/update-manager/release-upgrades root@profistat:/var/log/dist-upgrade# /etc/update-manager/release-upgrades /etc/update-manager/release-upgrades -bash: /etc/update-manager/release-upgrades: Permission denied
Solution: mv /usr/share/dbus-1/system-services/org.freedesktop.systemd1.service /usr/share/dbus-1/system-services/org.freedesktop.systemd1.service.bak
sudo apt-get install -f apt-get update apt upgrade apt dist-upgrade apt autoremove