Please see your "devices in use" section:
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC0D1p: karthik 2042 F...m g2ipmsg
The IM client you're using has forcibly hogged the sound device, which
prevents PulseAudio from working correctly.
** Changed in: pulseaudio (Ubuntu)
Status: New => Invalid
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[IDT 92HD71B7X] pactl stat failed to find default card
https://bugs.launchpad.net/bugs/631895
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