Here is how I solved the problem. That's it! [IMAGE]    
Hello, I have a Dell Mobile Pro Mouse connected via Bluetooth very well on Windows 11 with no issues. My machine is dual boot as I need Ubuntu 20.04 for my work. The problem is the mouse is detected as a Bluetooth device but can not be paired. [IMAGE] All help is appreciated.
Dell Mobile Pro Wireless Mouse - MS5120W Ubuntu 20.04