Take the 2-minute tour ×  I was perusing the interfaces file in
the path /etc/network/ on a Ubuntu 12.04 LTS laptop that is
connected to the wireless network and noticed that there are no
entries. Why is that?  I am able to browse to websites, access
emails, etc  enter image description here  share|improve this
question add comment  1 Answer  up vote 2 down vote accepted
That file is for an antiquated network configuration method
which is deprecated (meaning that it is only used if you
specifically disable its replacement and enable it).  The reason
it was deprecated is that it's not very customizable or
configurable. For instance, you can't supply WiFi passwords this
way. You can't configure Bluetooth or VPN connections. You can't
configure cellular broadband modems. You also can't change the
configuration dynamically at runtime, and any graphical
interface that attempts to adjust it at runtime is doomed to
failure because of the wonky configuration file it uses.  The
replacement is called NetworkManager. T