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[RaspberryPi] Fix Missing Bluetooth Audio Sink

If you notice “error: a2dp-source profile connect failed for protocol not available“, probably in the log or via systemctl

sudo cat /var/log/syslog | grep -i protocol
sudo systemctl status bluetooth

open the bluealsa.service file

sudo nano /lib/systemd/system/bluealsa.service

and append the a2dp-sink:

ExecStart=/usr/bin/bluealsa --profile=a2dp-sink

Now reboot. Check with

sudo bluetoothctl show

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