GNURADIO doesn't find USRP B205

Hi, I've connected a B205mini with a Raspberry Pi4 (Raspbian OS). The Raspberry has discovered as follows. +++ pi@raspberrypi:~ $ uhd_find_devices [INFO] [UHD] linux; GNU C++ version 8.3.0; Boost_1067

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Ettus Research B205 + Raspberry Pi 4B + GNURADIO

Hi, it's my intention to use an Ettus B205mini connected to a Raspberry Pi 4 B (latest model with 8GB RAM) with GNURADIO running on it. During the first try with the current RASPBIAN OS the complete installation seems to be successful but the USRP sink block didn't found the B205mini althoug