Comment 2 for bug 1504871

Setting up libpam-systemd:amd64 (204-5ubuntu20.14) ...
initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart-session/1000/1520: Connection refused
invoke-rc.d: unknown initscript, /etc/init.d/systemd-logind not found.
dpkg: error processing package libpam-systemd:amd64 (--configure):
 subprocess installed post-installation script returned error exit status 100