Sound Troubleshooting Ubuntu

Open a terminal window.
sudo apt-get install pavucontrol

Now start pavucontrol and look how the tabs are. You start pavucontrol via the Fast Finder or via the terminal: you simply tap: pavucontrol (and press Enter).

pay attention: move the sliders do not all open at once, and no more than 90 % (deformation).

If this solution does not work, you can still offer the following solution.

Open a terminal window and displays the following command.
amixi -D pulse restrained Master 90%

Then, in the terminal,
-D pulse restrained Master on amixi

Now the sound should be at, on 90 % of the maximum volume.

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