Next, you need to install the "pulseaudio-bluetooth" package. In Ubuntu (and Debian), this package is named as "pulseaudio-module-bluetooth". ... enter the command "rfkill unblock bluetooth" and retry. If the pairing problems persist, try the command "hciconfig hci0 sspmode 0" and then retry. When the pairing is finally done. In case you've plugged in an HDMI cable, then unplugged it and you're no longer getting any sound on your Ubuntu desktop, the solution is quite simple. Plug in the HDMI device back and you should be able to switch back to the integrated / external speakers, then you can unplug the HDMI cable again. My screen privacy settings are as below: Blank Screen Delay = 10 minutes.