ubuntu 18.04 bluetooth not turning on code example

Example 1: ubuntu 20.04 bluetooth not turning on or working

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

# make it automatic on boot
sudo systemctl enable bluetooth

Example 2: ubuntu 18.04 bluetooth headset problem turning off

I restart it in the terminal, and it works:

Code:

$ sudo -i
# bluetoothctl
[bluetooth]# power off
[bluetooth]# power on
[bluetooth]# scan on
[bluetooth]# connect XX:XX:XX:XX:XX:XX (your bluetooth address)
[Arc Touch Mouse SE]# trust
[Arc Touch Mouse SE]# pair
[Arc Touch Mouse SE]# unblock
[Arc Touch Mouse SE]# power off
[bluetooth]# power on