Log Files in openHABian

I started with setting up the latest version of openHABian (thanks for this great project!) on a Pi3. I now start with adding some bindings/things. I have a very small set up oft Homematic devices (CCU2, wall thermostat, thermostat and window sensor). Unfortunately it will not find the Homematic CCu2 via the Paper UI. I placed a question on this a few days before. Now I need to find the logs that could help finding the problem. Where can I find the logs on openHABian?
Thanks!

They are found under /var/log/openhab2

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Thanks for fast reply!!!

In samba I see no logs is this correct?

\openhabianpi\openHAB-userdata\log

Correct!