====== Dell Latitude E6420 ======
====== WIFI ======
Con debian Jessie: \\
https://wiki.debian.org/brcm80211#Debian_7_.22Wheezy.22

  deb http://http.debian.net/debian/ wheezy main contrib non-free
  apt-get install firmware-brcm80211
  modprobe -r brcmsmac ; modprobe brcmsmac
  
Si no funciona, probad este: https://wiki.debian.org/wl#Debian_7_.22Wheezy.22