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I am trying to pair my ubuntu with a device (portable loudspeakers).
I have installed the bluetooth service, but the search process finds no device around. How can I solve this issue?

For more information, I post here the outcome of the command:
lspci -nnk | grep -iA2 net; lsusb; hciconfig -a; dmesg | egrep -i 'blue|firm'

as it may help:

02:00.0 Network controller [0280]: Broadcom Limited BCM43142 802.11b/g/n [14e4:4365] (rev 01)

    Subsystem: Lite-On Communications Inc BCM43142 802.11b/g/n [11ad:6675]

    Kernel driver in use: wl

--

03:00.2 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136] (rev 06)

    Subsystem: ASUSTeK Computer Inc. RTL810xE PCI Express Fast Ethernet controller [1043:200f]

    Kernel driver in use: r8169

    Kernel modules: r8169

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

Bus 001 Device 005: ID 045e:07b2 Microsoft Corp. 

Bus 001 Device 004: ID 04ca:2006 Lite-On Technology Corp. Broadcom BCM43142A0 Bluetooth Device

Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. Hub

Bus 001 Device 002: ID 04f2:b483 Chicony Electronics Co., Ltd 

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

hci0:   Type: Primary  Bus: USB

    BD Address: D0:53:49:6A:93:5E  ACL MTU: 1021:8  SCO MTU: 64:1

    UP RUNNING 

    RX bytes:1697 acl:0 sco:0 events:106 errors:0

    TX bytes:5594 acl:0 sco:0 commands:105 errors:0

    Features: 0xff 0xfe 0xcf 0xfe 0xdb 0xff 0x7b 0x87

    Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 

    Link policy: RSWITCH HOLD SNIFF 

    Link mode: SLAVE ACCEPT 

    Name: 'luca-X200MA'

    Class: 0x1c010c

    Service Classes: Rendering, Capturing, Object Transfer

    Device Class: Computer, Laptop

    HCI Version: 4.0 (0x6)  Revision: 0x0

    LMP Version: 4.0 (0x6)  Subversion: 0x210b

    Manufacturer: Broadcom Corporation (15)



[    0.075223] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored

[   15.356368] Bluetooth: Core ver 2.22

[   15.356405] Bluetooth: HCI device and connection manager initialized

[   15.356412] Bluetooth: HCI socket layer initialized

[   15.356415] Bluetooth: L2CAP socket layer initialized

[   15.356425] Bluetooth: SCO socket layer initialized

[   15.463177] Bluetooth: HCI UART driver ver 2.3

[   15.463180] Bluetooth: HCI UART protocol H4 registered

[   15.463181] Bluetooth: HCI UART protocol BCSP registered

[   15.463228] Bluetooth: HCI UART protocol LL registered

[   15.463230] Bluetooth: HCI UART protocol ATH3K registered

[   15.463231] Bluetooth: HCI UART protocol Three-wire (H5) registered

[   15.463276] Bluetooth: HCI UART protocol Intel registered

[   15.463324] Bluetooth: HCI UART protocol Broadcom registered

[   15.463325] Bluetooth: HCI UART protocol QCA registered

[   15.463327] Bluetooth: HCI UART protocol AG6XX registered

[   15.463328] Bluetooth: HCI UART protocol Marvell registered

[   15.659845] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2

[   19.102046] Bluetooth: hci0: BCM: chip id 70

[   19.103057] Bluetooth: hci0: BCM: features 0x06

[   19.119066] Bluetooth: hci0: BCM43142A

[   19.119072] Bluetooth: hci0: BCM (001.001.011) build 0000

[   19.178971] bluetooth hci0: Direct firmware load for brcm/BCM.hcd failed with error -2

[   19.178977] Bluetooth: hci0: BCM: Patch brcm/BCM.hcd not found

[   21.184025] Bluetooth: hci0: command 0x1003 tx timeout

[   35.575023] Bluetooth: BNEP (Ethernet Emulation) ver 1.3

[   35.575025] Bluetooth: BNEP filters: protocol multicast

[   35.575031] Bluetooth: BNEP socket layer initialized

[  101.604843] Bluetooth: RFCOMM TTY layer initialized

[  101.604853] Bluetooth: RFCOMM socket layer initialized

[  101.604864] Bluetooth: RFCOMM ver 1.11

[  493.254267] Bluetooth: hci0: last event is not cmd complete (0x0f)

[  586.175965] Bluetooth: hci0: last event is not cmd complete (0x0f)