It is working now. As I expected the Grafana Package was missing.
Solution was:
SSH in Openhab
sudo openhabian-config
Go to “20 Optional Components” > “24 InfluxDB+Grafana” <>
After installation and reboot it is working now 
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Ups! Why would/ should packages needed for not used components solve the problem with charts? I have no clue!
I have no idea but it is working 
I also can confirm this behaviour
Great work P4trick!
Worked for me too!
Unbeliveable… Same for me, had the same issue and this worked. Thank you!
@maisen20, @crutjohan, @J35u5fr34k, @P4trick
Could you please post what kind of openhabian installation you have (stable, Milestone, snapshot all with the respective version #) .
I’m on a openhabian version running the stable 2.4 release and had no issue with the charts nor with rrd4j!
My openhabian installation:
openHAB 2.5.0 Build #1572
Sorry for reviving this old thread, but I just stumbled upon the same issue and managed to solve it without installing Grafana. As I came up at this thread, I want to share my solution for future users experiencing the same problem.
The problem is simply a missing font package. Simply installing
sudo apt install libfontconfig1
did it for me. After a restart of the openhab2 service the graphs are now working for me.
Greetings, Level147
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Thanks to you. I had exactly the same problem and it is now working again.
Just for your information.
I got the following error message after the installation. But after the reboot went everything fine.
[ERROR] [nternal.extensions.ExtensionResource] - Exception while installing extension: No extension service registered for influxdb
For me it was another reason that the charts weren’t working: I have two persistence services (rrd4j and mongodb) running. In this case, I ran into an error “persistence unqueryable”. To fix this, set a default persistence service in the Openhab UI, “Settings > Persistence > RRD4j”.