Adjust Ubuntu Sound Volume

Peo­ple installed Ubuntu may found that the sound vol­ume is lower than the vol­ume it should be. My solu­tion is this. Type the fol­low­ing com­mand in your terminal.

After that, you can nav­i­gate by press­ing left and right key on the key­board, and adjust by press­ing up and down key.Esc to exit.