Can't connect my Bluetooth headset

This is my Bluetooth hardware
$ lsusb
Bus 001 Device 006: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)

I followed instructions from here

When I click on the Bluetooth icon in the systray it just says “Searching for devices”.
It stays like that forever. Never finds my headset which is powered ON.

This USB Bluetooth dongle & this headset was working fine under Linux Mint 20 so I know
that the hardware is fine.

How can I solve this ?

I am extremely sorry guys. I missed these two commands

sudo systemctl start bluetooth –> start till next reboot/power off system

sudo systemctl enable bluetooth –> enable to start on booting the machine (permanent)