Okay, I've had this exact same problem sprout up seemingly randomly.
Pulseaudio was working fine for everything, even able to divert streams
to a bluetooth headset until suddenly everything was just this static
like, crackly sound. Even the system sounds at startup.
Anyway, I found buried deep in a thread this very simple fix:
{ Originally Posted by psyke83
EDIT: My apologies. I thought I was replying to the Hardy thread.
It seems a lot of users are having problems with the PCM mixer
erroneously being set to 0 or muted.
Check the volume levels:
In terminal: $ alsamixer -Dhw
}
Anyway, that was the case for me. PCM was set to 0. I set it up to 100
and then pressed esc. After that all audio is working again without a
hitch.
--
Sound output from PulseAudio replaced with static after update
https://bugs.launchpad.net/bugs/275392
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