How to use an external bluetooth speaker in linux

If you want to use an external bluetooth headphone or speaker paired with your computer, there's the small steps to follow:

sudo apt-get install bluetooth blueman bluez pulseaudio-module-bluetooth bluez-firmware

Important notes:

if you have the "connman" package installed you must uninstall it first or to install "connman-gtk" and enable the bluetooth device, otherwise you won't be able to enable it
Make sure that your bluetooth is enabled in your bios, if you have it and doesn't appears as an adapter

Remove the previous pulseaudio configurations, otherwise you will be unable to connect it

rm -r ~/.config/pulse ; pulseaudio -k

Play some music or any audio in your computer (this is suggested in order to enable the "Audio Sink" option in your pulseaudio system)
run the bluetooth app (you have it also in your menus)

blueman-applet

Turn ON your bluetooth speaker and press the button to start a new pairment with devices
Select "Devices" from the menu of blueman-applet (should appear as a gadget in the corner, otherwise run the command "blueman-manager")
Scan / Search for devices
Right click on your bluetooth device when it appears, select "Pair"
Right click again, select "Connect" to "Audio Sink" (if you have it, its the preferred one and more compatible)
Right click again, select "High Fidelity" in your "Audio Profile" section
Restart your audio / music application, and play some audio again
Right click again, select "Trust" to remember this device

add blueman to your startup applications
make sure that the device is on mode "trust"
on desktop startup, if has not automatically connected, right click on the gadget and select "recent connections"

😄 Enjoy! 😄