I have been using a Logitech Bluetooth keyboard for a while now with my Ubuntu 20.04. Everything worked well without any issues until one day the operating system refused to turn on the Bluetooth. I could toggle Bluetooth On button from the Settings, but it did nothing. After spending some time Google Searching why my Bluetooth started not working all of a sudden, and after trying a variety of commands to troubleshoot the problem, I finally found a working fix for this issue. Open a Terminal ( Ctrl + Alt + T ) and enter below commands one after another. sudo rmmod btusb sudo modprobe btusb That's it. Your Bluetooth issue would be now solved. I can guarantee you this problem is going to pop-up every now and then. So copy the above commands to a text file for future uses. Sometimes, even after entering above commands the bluetooth would refuse to turn on. In such cases, just Suspend the system and then wake up it again and check.
