Unifi-7.5 release doesnt seem to support arm so I held the version at 7.4.
[Unit]
Description=Octoprint
After=network.target
[Service]
Environment="LC_ALL=C.UTF-8"
Environment="LANG=C.UTF-8"
User=octoprint
Group=octoprint
WorkingDirectory=/opt/octoprint/
ExecStart=/usr/local/bin/octoprint
[Install]
WantedBy=multi-user.target