bluetooth won't turn on

[Simo Cocco]

the bd address isn't 00:00:00:00:00:00, but it won' turn on

on Ubuntu LTS 18.04.04

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-5.3.0-45-generic 5.3.0-45.37~18.04.1
ProcVersionSignature: Ubuntu 5.3.0-45.37~18.04.1-generic 5.3.18
Uname: Linux 5.3.0-45-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Apr 2 09:55:52 2020
InstallationDate: Installed on 2020-03-10 (22 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-signed-hwe
UpgradeStatus: No upgrade log present (probably fresh install)