GNU/Linux Ubuntu 21.10 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 for Ubuntu 21.10 Impish GNU/Linux.
And the Ubuntu Impish ASUS USB-BT500 Setup is based on the Realtek rtl8812AU 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 Ubuntu 21.10 ASUS USB-BT500 Bluetooth Driver Installation Guide