Wi-Fi working but Bluetooth is not working on Dell Vostro 3350

Question

I have just installed latest version of ubuntu on my laptop Dell Vostro 3350 and my Wi-Fi works just fine, but the Bluetooth is not working or detected at all.

Below a screenshot from my laptop:

Result after running dmesg | egrep -i 'blue|firm'

[    0.214235] Spectre V2 : Enabling Restricted Speculation for firmware calls
[    0.291902] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[   47.801460] b43-phy0: Loading firmware version 666.2 (2011-02-23 01:15:07)
[  164.241397] b43-phy0: Loading firmware version 666.2 (2011-02-23 01:15:07)
[  180.113487] b43-phy0: Loading firmware version 666.2 (2011-02-23 01:15:07)
[  385.969376] b43-phy0: Loading firmware version 666.2 (2011-02-23 01:15:07)

Result for lsusb

Bus 002 Device 005: ID 0bda:0138 Realtek Semiconductor Corp. RTS5138 Card Reader Controller
Bus 002 Device 014: ID 413c:818d Dell Computer Corp. 
Bus 002 Device 003: ID 138a:0011 Validity Sensors, Inc. VFS5011 Fingerprint Reader
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0c45:6484 Microdia 
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub