Microphone not working on 18.04 for any web or desktop conference app: No one can hear me

Solution 1:

Your Ubuntu is listening to the stereo mic with left and right channels. You can eliminate one channel (either left or right).

1. First you need to run Pavucontrol by running on your terminal:

   pavucontrol
   

If Pavucontrol is not installed, you install it with this command:

```
sudo apt-get install pavucontrol
```

2. Go to the input tab and click on the lock icon.

3. You should now see the left and the right sliders. Slide one slider to the left until it's 0%

4. Chrome and some other apps may adjust your volume automatically, undoing step 3. To prevent this behavior in Chrome, install the "Disable Automatic Gain Control" extension.