I know there are many questions about this, but no one works for me.

I have been more than a week testing blogs, github and forum solutions, actually I really don't know what I have installed, blacklisted and created to try to get back my wifi adapter.

Problem started after I connect my ipad to my laptop.

Manufacturer: Dell Inc.
Product Name: Inspiron 3521

Kernel release:

5.4.0-37-generic

If I throw this line:

lspci -knn | grep Net -A3; rfkill list

Output:

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

    Subsystem: Dell Wireless 1704 802.11n + BT 4.0 [1028:0016]

    Kernel modules: bcma, wl

0: hci0: Bluetooth

    Soft blocked: no

    Hard blocked: no

If I throw this line

sudo modprobe wl

Output:

modprobe: FATAL: Module wl not found in directory /lib/modules/5.4.0-37-generic

If I throw this line:

grep wl /etc/modprobe.d/*

Output:

/etc/modprobe.d/iwlwifi.conf:# /etc/modprobe.d/iwlwifi.conf

/etc/modprobe.d/iwlwifi.conf:# iwlwifi will dyamically load either iwldvm or iwlmvm depending on the

/etc/modprobe.d/iwlwifi.conf:# microcode file installed on the system.  When removing iwlwifi, first

/etc/modprobe.d/iwlwifi.conf:# remove the iwl?vm module and then iwlwifi.

/etc/modprobe.d/iwlwifi.conf:remove iwlwifi 

/etc/modprobe.d/iwlwifi.conf:(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) 

/etc/modprobe.d/RTL810xE.conf:options RTL810xE fwlps=N

BIOS:

secure boot disable

load legacy option Enable

Boot list option legacy

Secure Boot not enabled on this system.
Done.

if I throw sudo apt install --reinstall bcmwl-kernel-source:

wl.ko:

Running module version sanity check.

 - Original module

   - No original module exists within this kernel

 - Installation

   - Installing to /lib/modules/5.4.0-37-generic/updates/dkms/



depmod.........



DKMS: install completed.

update-initramfs: deferring update (trigger activated)

Processing triggers for man-db (2.9.1-1) ...

Processing triggers for initramfs-tools (0.136ubuntu6) ...

update-initramfs: Generating /boot/initrd.img-5.4.0-37-generic

Anyone could help me?