$ sudo wget https://cfengine-package-repos.s3.amazonaws.com/community_binaries/Community-3.15.3/agent_ubuntu18_x86_64/cfengine-community_3.15.3-1.ubuntu18_amd64.deb
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$ sudo apt install ./cfengine-community_3.15.3-1.ubuntu18_amd64.deb
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$ sudo cf-agent --bootstrap 192.168.38.131
R: Bootstrapping from host '192.168.38.131' via built-in policy '/var/cfengine/inputs/failsafe.cf'
R: This host assumes the role of policy server
R: Updated local policy from policy server
R: Triggered an initial run of the policy
R: Restarted systemd unit cfengine3
  notice: Bootstrap to '192.168.38.131' completed successfully!