Mmm. Maybe this doesn't work all the time. It didn't work an identical PC. However installing pipewire audio did.
I can take no credit for this. I got it from the Ubuntu Forums.
Open your terminal and follow these steps:
We will use a PPA for adding Pipewire to Ubuntu 20.04, which is maintained regularly:
sudo add-apt-repository ppa:pipewire-debian/pipewire-upstream
To update the PPA packages in your system do:
sudo apt update
Install the package:
sudo apt install pipewire
There is also a dependency needed to be installed with Pipewire, otherwise you will face the issue of “Bluetooth headset won’t connect after installing pipewire”. Install the dependency by:
sudo apt install libspa-0.2-bluetooth
Now, to install the client libraries:
sudo apt install pipewire-audio-client-libraries
Reload the daemon:
systemctl --user daemon-reload
Disable PulseAudio:
systemctl --user --now disable pulseaudio.service pulseaudio.socket
If you are on Ubuntu 20.04, you also need to “mask” the PulseAudio by:
systemctl --user mask pulseaudio
I am not sure but, if possible, you can try to run this on other versions too.
9. After a new update of Pipewire, you also need to enable pipewire-media-session-service:
systemctl --user --now enable pipewire-media-session.service
You can ensure that Pipewire is now running through:
pactl info
This command will give the following output, in Server Name you can see:
PulseAudio (on PipeWire 0.3.28)
Things should be working by now and you can see your microphone.
If it doesn’t show up, then try restarting Pipewire by this command:
systemctl --user restart pipewire
Edit: You need to uninstall ofono and phonesim from your system if you have them installed.
sudo apt remove ofono
sudo apt remove ofono-phonesim
If it’s still not showing your microphone, you can try rebooting once and remove and pair your Bluetooth device again to check if it works now.
I hope I have helped you solve your problem.
If you want to rollback all the changes we did, you can do it by using:
systemctl --user unmask pulseaudio
systemctl --user --now enable pulseaudio.service pulseaudio.socket