bluetooth audio not working ubuntu code example

Example 1: ubuntu bluetooth not working

#turn bluetooth on:
sudo /etc/init.d/bluetooth restart

# make it automatic on boot
sudo systemctl enable bluetooth

Example 2: 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