Ubuntu under Kazam Recording screen no sound solution

The following reference https://www.youtube.com/watch?v=5NZ0qwp2L04, I made some changes, let it understood some.

1. Search the App Store for PulseAudio Volume Control on the Ubuntu Store homepage https://apps.ubuntu.com/cat/applications/pavucontrol/or directly click apt:// Pavucontrol Jump to the store installation.
2. To enter this software, click on the tab input Devices, then click on the bottom show, switch to all Input Devices.
3. Now let your computer play a sound, you will see one of the devices below the progress bar is fluctuating, the larger the sound, the longer the progress bar, remember the device name.
4. Then let the wave of the bar be yellow (different from gray), click on the right three buttons in the first implementation switch.
5. In Kazam's perference, select speakers for the device name above. That's good, thanks for watching.

Ubuntu under Kazam Recording screen no sound solution