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I tried reinstalling and that didn't help, Any ideas what I need to do?
Ubuntu Server 15



● lfd.service - ConfigServer Firewall & Security - lfd
Loaded: loaded (/usr/lib/systemd/system/lfd.service; enabled; vendor preset: enabled)
Active: failed (Result: signal) since Sat 2016-07-02 00:30:24 PDT; 21min ago
Process: 4911 ExecStart=/usr/sbin/lfd (code=exited, status=0/SUCCESS)
Main PID: 4914 (code=killed, signal=KILL)

Jul 02 00:30:19 domain.com systemd[1]: Starting ConfigServer Firewall & Security - lfd...
Jul 02 00:30:19 domain.com systemd[1]: Started ConfigServer Firewall & Security - lfd.
Jul 02 00:30:24 domain.com systemd[1]: lfd.service: Main process exited, code=killed, status=9/KILL
Jul 02 00:30:24 domain.com systemd[1]: lfd.service: Unit entered failed state.
Jul 02 00:30:24 domain.com systemd[1]: lfd.service: Failed with result 'signal'.

I had this recently on one server which wasn't used for much, it was due to not having either postfix or sendmail installed.

Installed sendmail and all worked fine.