No WLAN adapter showing - Broadcom

I have spent a few hours googling this problem; I'm finally at my wits' end so here goes. The WLAN adapter is not working at all in Kali.

Dell Inspiron 15

Code:

---

# uname -a
3.18.0-kali3-amd64 #1 SMP Debian 3.18.6-1~kali2 (2015-03-02) x86_64 GNU/Linux

---

Code:

---

# lspci -vknn | grep Network
06:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)

---

Sources.list:

Code:

---

# deb cdrom:[Debian GNU/Linux 7.0 _Kali_ - Official Snapshot amd64 LIVE/INSTALL Binary 20150205-22:46]/ kali contrib main non-free

#deb cdrom:[Debian GNU/Linux 7.0 _Kali_ - Official Snapshot amd64 LIVE/INSTALL Binary 20150205-22:46]/ kali contrib main non-free

deb http://http.kali.org/kali kali main non-free contrib
deb-src http://http.kali.org/kali kali main non-free contrib

## Security updates
deb http://security.kali.org/kali-security kali/updates main contrib non-free

---

The following packages are installed:

Code:

---

b43-fwcutter
broadcom-sta-common
broadcom-sta-source
firmware-brcm80211
firmware-linux-nonfree

---

/etc/network/interfaces:

Code:

---

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp

---

Thanks in advance for any tips and guidance.

I tried following the instructions here: https://wiki.debian.org/wl.

Got stuck on this step.

Quote:

---

~# modprobe wl
libkmod: ERROR ../libkmod/libkmod-module.c:791 kmod_module_insert_module: could not find module by name='wl'
ERROR: could not insert 'wl': Function not implemented
libkmod: ERROR ../libkmod/libkmod-module.c:925 command_do: Error running install command for wl
ERROR: could not insert 'wl': Operation not permitted

---

Same. This issue is still not fixed, I think nobody knows how to make it work. Very frustrating.