Recently gave a Lenovo notebook installed Ubuntu14.04 system, boot the top right corner of the screen does not appear WiFi information, does have a gray body "WiFi has been disabled by a hardware switch" to see that my heart rushing past a group of prairie animals, boot off WiFi, WiFi laptop can not even do what? ? ?
Do not worry, take your time, look at this literal meaning, is disabled, well, I put you allows just fine thing
Google about it, finally solved the problem, these two commands, WiFi back.
as follows:
sudo rfkill list all
sudo modprobe -r ideapad_laptop
rfkill is used to control the use of the wireless network and Bluetooth soft switching.
modprobe loadable module for specified individual or a group of modules dependent load.