Preventing auto-start on Linux

Austin Green <austin.green-q3Ck4f9/[email protected]> Mon, 27 Mar 2017 17:32:26 +1300
Newsgroups gmane.network.freenet.support
Message-ID <[email protected]>
Hello,

I've installed Freenet successfully on a Linux (Ubuntu-derived) system, and it starts up automatically when the system starts.  How can I prevent that?  I would prefer to start it manually.

Thanks.