Install libpam-blue by entering the following commands in the terminal:
sudo apt update sudo apt install libpam-blue
PAM module for local authenticaction with bluetooth devices
pam_blue is a dynamically loadable binary object for the PAM security framework in Linux. It is presented as an extension for the common PAM modules, gives the user the ability for authenticate via a Bluetooth-compatible device like a cell phone or other bluetooth dongles (e.g. epox-presenter). Due to the fact that a whole part of the Bluetooth stack is implemented in hardware-side it is relatively difficult to change the Bluetooth hardware MAC address which makes this module more secure.