Thank you for the hint.
I moved the .cfg file and restarted the service but unfortunately it doesn’t fix the issue 
But the hint was very helpful 
I found within the folder /var/lib/openhab2/config/org/openhab an additional addons.config.
Content:
binding=“innogysmarthome,astro,network,sonos”
misc=“ruleengine”
package=“standard”
service.pid=“org.openhab.addons”
ui=“paper,habpanel”
and I enhanced the last line by ,classic,basic,habmin
restarted the service afterwards and voila, the issue was fixed.
Great! Thank you very much for your help. 
Best regards
Andreas