bluetooth

I'm using Xubuntu which has XFCE as DE. And it's possible to switch users fast with hotkeys, without locking them. Hotkey is Ctrl+Alt+F7 (F8, F9, F10, F11).
Pulseaudio works isolated with each user so sounds are not mixed and it's good.
But bluetooth has an issue there: when you connecting to already paired bluetooth device it can be connected to ANOTHER logged user. How you can check it? Profiles will not be available when you click right mouse in bluetooth-manager applet. 

There was error connecting bluetooth headphones in Ubuntu (xfce) 16.04 : "Connection Failed: blueman.bluez.errors.DBusFailedError: Protocol not available".

One of the solutions is installing bluetooth module for pulseaudio

1) sudo apt-get install pulseaudio-module-bluetooth
2) pactl load-module module-bluetooth-discover

or

sudo service pulseaudio restart

or

pkill pulseaudio

3) Remove device from the list and try to pair it again.