刚刚通过 do-release-upgrade 更新，现在某些新贵工作，如 fail2ban 和 plexmediaserver 将无法启动（已尝试重新安装）
$ sudo service fail2ban start
Job for fail2ban.service failed. See "systemctl status fail2ban.service" and "journalctl -xe" for details.
$ systemctl status fail2ban.service
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.
$ …