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Ubuntu - Sound - Troubleshooting

Try this first:

killall pulseaudio; pulseaudio -k  ; rm -r ~/.config/pulse/* ; rm -r ~/.pulse*

Wait ten seconds, then run this:

pulseaudio --start

Should the approach above fail to correct the problem (it is only known to work on some variations), you can try this next:

killall pulseaudio; pulseaudio -k; rm -r ~/.config/pulse/* ; rm -r ~/.pulse*

wait 10 seconds, then reboot (putting the machine to sleep is not enough – fully power it off and then back on).

NOTE: Make sure to save your work first.

References