I just installed LibreNMS on a Ubuntu Server. Only none of the graphs will show any data. They all shows nan.
permissions for the RRD folder and poller rights seems to be good as far as I can see.
sven@ubuntu:/opt/librenms$ ./validate.php
==========================================================
Component | Version
--------- | -------
LibreNMS | 292c4382c1f020412aaf1e0ad7a1af80d21e3e50
DB Schema | 155
PHP | 7.0.13-0ubuntu0.16.04.1
MySQL | 10.0.28-MariaDB-0ubuntu0.16.04.1
RRDTool | 1.5.5
SNMP | NET-SNMP 5.7.3
==========================================================
[FAIL] You need to run this script as root or librenms
[WARN] Your install is out of date, last update: Tue, 17 Jan 2017 17:42:48 +0000
[OK] Database connection successful
[FAIL] The poller has not run in the last 5 minutes, check the cron job