Can't connect Mambo in Sphinx

I am trying to connect my Smartphone with a simulated Mambo drone in Sphinx, but neither FreeFlight Mini nor any other software is able to find the drone. I use Ubuntu 18.04.
I adapted the stolen address manually in the mambo.drone file, as shown below.

<?xml version="1.0" encoding="UTF-8"?>
  <!-- !! to be completed with your actual Bluetooth MAC address !! -->

My bluetooth returns that my bluetooth device is based on a CSR chipset.

$ lsusb | grep -i bluetooth
Bus 002 Device 004: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
$ cat /sys/kernel/debug/usb/devices | grep "CSR" -B2
D:  Ver= 2.00 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=0a12 ProdID=0001 Rev=88.91
S:  Product=CSR8510 A10

While running Sphinx, I managed to retrieve the bluetooth identifier (UUID) of the simulated drone.

$ fdc list instances
$ fdc show instances efficacious_adelina | grep cmdline | sed 's/ /\n/g' | awk -F= '$1 ~ /ro.sphinx.btfriendlyname/{print $2}'

I still can’t find the bluetooth on the FreeFlight Mini App. Do you have any suggestion of what maybe happening?

I downgraded to Ubuntu Xenial 16.04.
It worked!