Today I set up a fresh Raspberry Pi Zero W with Grafana:
- wget https://s3-us-west-2.amazonaws.com/grafana-releases/release/grafana_5.2.1_armhf.deb
- sudo dpkg -i grafana_5.2.1_armhf.deb
- sudo systemctl enable grafana-server
- sudo systemctl start grafana-server
After that the web login is not reachable 
Also “service grafana-server status” reports an error:
● grafana-server.service - Grafana instance
Loaded: loaded (/usr/lib/systemd/system/grafana-server.service; enabled; vendor preset: e
Active: failed (Result: signal) since Tue 2018-07-17 19:56:05 CEST; 31s ago
Docs: http://docs.grafana.org
Process: 1832 ExecStart=/usr/sbin/grafana-server --config=${CONF_FILE} --pidfile=${PID_FIL
Main PID: 1832 (code=killed, signal=ILL)Jul 17 19:56:05 pizerow systemd[1]: grafana-server.service: Failed with result ‘signal’.
Jul 17 19:56:05 pizerow systemd[1]: grafana-server.service: Service hold-off time over, sche
Jul 17 19:56:05 pizerow systemd[1]: Stopped Grafana instance.
Jul 17 19:56:05 pizerow systemd[1]: grafana-server.service: Start request repeated too quick
Jul 17 19:56:05 pizerow systemd[1]: Failed to start Grafana instance.
Jul 17 19:56:05 pizerow systemd[1]: grafana-server.service: Unit entered failed state.
Jul 17 19:56:05 pizerow systemd[1]: grafana-server.service: Failed with result ‘signal’.