Grafana server instance not active

Hi,
after Installation on Defaults I have the following issue. I am not a Linux Guru, so any Ideas from you?
Thanks

service grafana-server status
grafana-server.service - Grafana instance
Loaded: loaded (/usr/lib/systemd/system/grafana-server.service; enabled)
Active: failed (Result: start-limit) since Wed 2017-12-20 10:39:31 UTC; 13min ago
Docs: http://docs.grafana.org
Process: 1490 ExecStart=/usr/sbin/grafana-server --config=${CONF_FILE} --pidfi le=${PID_FILE_DIR}/grafana-server.pid cfg:default.paths.logs=${LOG_DIR} cfg:defa ult.paths.data=${DATA_DIR} cfg:default.paths.plugins=${PLUGINS_DIR} (code=exited , status=1/FAILURE)
Main PID: 1490 (code=exited, status=1/FAILURE)

Dec 20 10:39:31 vsa2409250 systemd[1]: Unit grafana-server.service entered faile d state.
Dec 20 10:39:31 vsa2409250 systemd[1]: grafana-server.service holdoff time over, scheduling restart.
Dec 20 10:39:31 vsa2409250 systemd[1]: Stopping Grafana instance…
Dec 20 10:39:31 vsa2409250 systemd[1]: Starting Grafana instance…
Dec 20 10:39:31 vsa2409250 systemd[1]: grafana-server.service start request repe ated too quickly, refusing to start.
Dec 20 10:39:31 vsa2409250 systemd[1]: Failed to start Grafana instance.
Dec 20 10:39:31 vsa2409250 systemd[1]: Unit grafana-server.service entered faile d state.

Can you check the grafana server logs to see what the actual error is. The log file is probably located at:

/var/log/grafana/grafana.log