vivid - failed to connect to upstart: connection refused

Just updated via do-release-upgrade and now certain upstart jobs such as fail2ban and plexmediaserver will not start (have tried reinstalling)

sudo service fail2ban start
Job for fail2ban.service failed. See "systemctl status fail2ban.service" and "journalctl -xe" for details.

 systemctl status fail2ban.service
â fail2ban.service - Fail2Ban Service
   Loaded: loaded (/lib/systemd/system/fail2ban.service; enabled; vendor preset: enabled)
   Active: failed (Result: start-limit) since Mon 2015-04-27 19:47:27 BST; 26s ago
     Docs: man:fail2ban(1)
  Process: 14423 ExecStart=/usr/bin/fail2ban-client -x start (code=exited, status=255)

sudo service plexmediaserver start
Failed to start plexmediaserver.service: Unit plexmediaserver.service failed to load: No such file or directory.

sudo dpkg -i plexmediaserver_0.9.11.16.958-80f1748_amd64.deb
(Reading database ... 88738 files and directories currently installed.)
Preparing to unpack plexmediaserver_0.9.11.16.958-80f1748_amd64.deb ...
stop: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused

Any ideas with where to start on this?