This may fix it sometimes:
Try clicking sound, volume control,
Make sure Master, PCM, and Front are loud enough,
Stop all music players, and toggle the mute/unmute button for Master, PCM, and
Front.
When sound is unmuted try again, it should sound normal.
** Changed in: pulseaudio (Ubuntu)
Status: Incomplete => Confirmed
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All sound is static screeching popping and distorted
https://bugs.launchpad.net/bugs/367544
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