Hello @gerko,
Thanks for reaching out to us!
This error message can be usually disregarded, but if you would really like to get rid of it, you could blacklist the Bluetooth module btusb from loading by adding it into the /etc/modprobe.d/blacklist.conf file and then rebooting the module as explained here: https://linuxconfig.org/how-to-blacklist-a-module-on-ubuntu-debian-linux
Please note that by doing so, you are disabling the Bluetooth module. Let me know how it goes 