Merci pour ta réponse et oui j'ai regarder plusieurs heures mais pas trouvé mon bonheur.
Pour les retours de commande :
ii libbluetooth3:amd64 5.48-0ubuntu3.1 amd64 Library to use the BlueZ Linux Bluetooth stack
ii libgnome-bluetooth13:amd64 3.28.0-2ubuntu0.2 amd64 GNOME Bluetooth tools - support library
ii pulseaudio-module-bluetooth 1:11.1-1ubuntu7.2 amd64 Bluetooth module for PulseAudio sound server
engie@engie:~$ rfkill list all
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: brcmwl-0: Wireless LAN
Soft blocked: no
Hard blocked: no
3: acer-wireless: Wireless LAN
Soft blocked: no
Hard blocked: no
4: acer-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
engie@engie:~$ clear
engie@engie:~$ uname -a; lspci -nnk | grep -iA3 net; lsusb; dmesg | grep -i bluetooth; dmesg | grep -i firmware; lsmod | grep bluetooth
Linux engie 4.18.0-22-generic #23~18.04.1-Ubuntu SMP Thu Jun 6 08:37:25 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
02:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM43142 802.11b/g/n [14e4:4365] (rev 01)
Subsystem: Lite-On Communications Inc BCM43142 802.11b/g/n [11ad:6645]
Kernel driver in use: wl
Kernel modules: wl
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 0c)
Subsystem: Acer Incorporated [ALI] RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1025:0933]
Kernel driver in use: r8169
Kernel modules: r8169
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 04f2:b469 Chicony Electronics Co., Ltd
Bus 001 Device 005: ID 04ca:2009 Lite-On Technology Corp.
Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 002: ID 248a:00da
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
[ 4.817714] Bluetooth: Core ver 2.22
[ 4.817745] Bluetooth: HCI device and connection manager initialized
[ 4.817750] Bluetooth: HCI socket layer initialized
[ 4.817753] Bluetooth: L2CAP socket layer initialized
[ 4.817763] Bluetooth: SCO socket layer initialized
[ 4.966689] Bluetooth: hci0: BCM: chip id 70
[ 4.967867] Bluetooth: hci0: BCM: features 0x06
[ 4.998040] Bluetooth: hci0: engie
[ 4.999724] Bluetooth: hci0: BCM43142A0 (001.001.011) build 0000
[ 5.072783] bluetooth hci0: Direct firmware load for brcm/BCM43142A0-04ca-2009.hcd failed with error -2
[ 5.072790] Bluetooth: hci0: BCM: Patch brcm/BCM43142A0-04ca-2009.hcd not found
[ 7.104039] Bluetooth: hci0: command 0x1003 tx timeout
[ 7.771278] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 7.771281] Bluetooth: BNEP filters: protocol multicast
[ 7.771287] Bluetooth: BNEP socket layer initialized
[ 492.641886] Bluetooth: RFCOMM TTY layer initialized
[ 492.641896] Bluetooth: RFCOMM socket layer initialized
[ 492.641909] Bluetooth: RFCOMM ver 1.11
[ 0.020000] Spectre V2 : Enabling Restricted Speculation for firmware calls
[ 0.107012] acpi PNP0A08:00: [Firmware Info]: MMCONFIG for domain 0000 [bus 00-3f] only partially covers this bridge
[ 5.072783] bluetooth hci0: Direct firmware load for brcm/BCM43142A0-04ca-2009.hcd failed with error -2
bluetooth 552960 43 btrtl,btintel,btbcm,bnep,btusb,rfcomm
ecdh_generic 24576 2 bluetooth
engie@engie:~$