GNU/Linux Lubuntu ASUS USB-BT500 Bluetooth Driver Setup – Step-by-step Guide
Hi! The linked Tutorial shows you Step-by-Step How to Install ASUS USB-BT500 Wireless 802.11ac Driver in Lubuntu GNU/Linux Desktop.
And the Lubuntu ASUS USB-BT500 Setup is based on the Realtek RTL8761B Chipset Driver Installation.
So the linked guide explain How to Download and Install the RTL8761B Linux Driver.
Finally, in case to check your Adapter Chipset see: How to Check Wireless Device ID on GNU/Linux.
GNU/Linux Lubuntu ASUS USB-BT500 Bluetooth Driver Installation Guide