/Shell/Bash/My bluetooth audio doesn't sound good in ubuntu

My bluetooth audio doesn't sound good in ubuntu

$ sudo rm /var/lib/bluetooth/cache/*
$ dmesg | grep -i bluetooth
$ dmesg | grep -i bluetooth | grep -i firmware
$ lsub
$ sudo apt-get update
$ sudo apt-get install blueman
$ pactl list | grep -i bluetooth
$ pulseaudio --k
$ pulseaudio --start
$ init 0

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