How to set wifi in ubuntu 14.10 Thinkpad E431

参考网址：https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx?action=show&redirect=BroadcomSTA%28Wireless%29

command:

Open a Terminal and install the bcmwl-kernel-source package:

sudo apt-get update
sudo apt-get --reinstall install bcmwl-kernel-source

Note: If you see the message "Module build for the currently running kernel was skipped since the kernel source for this kernel does not seem to be installed" then you are missing the appropriate generic linux-header package(s).