B4J Tutorial jBluetooth under Linux: also works

But if to make lots of preparations:
0. Do not forget to include into the B4J library folder file: www.b4x.com/b4j/files/bluecove-2.1.1-SNAPSHOT.jar

1. Install Linux Bluetooth Bluecove stack (the library we have, thanks, @Erel):

sudo apt-get install bluez libbluetooth-dev

2. Include the user into "bluetooth" group:

sudo usermod -a -G bluetooth ${SUDO_USER:-$USER}

4. Setup driver settings:

sudo cp /lib/systemd/system/bluetooth.service /etc/systemd/system/bluetooth.service #copy the default BT settings file to edit

sudo sed -i 's|ExecStart=/usr/lib/bluetooth/bluetoothd|ExecStart=/usr/lib/bluetooth/bluetoothd -C|g' /etc/systemd/system/bluetooth.service #add "-C" key to the starting line of the BT deamon (start in the "compatibility" mode)

sudo systemctl daemon-reload #reload the BT deamon
sudo systemctl restart bluetooth #restart BT service

5. Give rights for SDP (Service Discovery Protocol):

sudo chmod 0777 /var/run/sdp

...And do not forget to switch the BT module on at the "icon-tray".... and anyway some non-stability of work

Spoiler

and if to try to make this all in the scripts of a .deb-package - to kill himself is much simpler. But i'm alive