Please execute the following commands in a terminal in order to install the Empyrean udev rules to your Debian-based Linux PC:
curl -fsSL https://raw.githubusercontent.com/etherkit/ArduinoBoards/master/etherkit-samd-1.0.0/10-empyrean.rules | sudo tee /etc/udev/rules.d/10-empyrean.rules
sudo service udev restart