move systemd prefixes to software prefixes

active/software_unifi-server/unifi-server.md

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+# Unifi Server
+
+<https://help.ui.com/hc/en-us/articles/220066768-Updating-and-Installing-Self-Hosted-UniFi-Network-Servers-Linux>
+
+## Prereqs
+
+This runs best on Ubuntu 20.04. See active/`infrastructure_ubuntu`.
+
+## Install
+
+```bash
+apt-get update && apt-get install ca-certificates apt-transport-https
+echo 'deb [ arch=amd64,arm64 ] https://www.ui.com/downloads/unifi/debian stable ubiquiti' | tee /etc/apt/sources.list.d/100-ubnt-unifi.list
+wget -O /etc/apt/trusted.gpg.d/unifi-repo.gpg https://dl.ui.com/unifi/unifi-repo.gpg
+wget -qO - https://www.mongodb.org/static/pgp/server-3.6.asc | apt-key add -
+echo "deb [trusted=yes] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/3.6 multiverse" | tee /etc/apt/sources.list.d/mongodb-org-3.6.list
+apt-get update
+apt-get update && apt-get install unifi -y
+```