Sound problem in Linux Lite 6.4

[stevef]

Don't know what is going on that error and the unstable window.

Try a none GUI method to unmute.

After a reboot, open a terminal with 'Ctrl' 'Alt 'T'

Code:

alsamixer

followed by enter

Ensure Playback devices are shown by pressing F3

Depending on your hardware there may be multiple columns each representing an audio device.
At the bottom is the device name, next up is a pair of numbers showing left/right balance.
Above that is the device status and above that a coloured bar representing the volume.

Check the status of each device looking at the box at the base of the column.
'OO' means On
'MM' means Muted

Select any devices showing MM by using left or right arrows so that the name is bracketed by <name>
Press m to toggle between MM (mute) and OO (unmuted)

Exit with Esc

If that works we can go back to the unstable window.