ThinkPad e431/e531 ubuntu 14.04 Install wireless card driver

After the Ubuntu system is installed, the unlimited NIC driver is not available. Need to download the wireless card driver yourself. Here's the simplest approach:

sudo apt-get install linux-headers-generic build-essential dkms  sudo apt-get install linux-source  sudo apt-get Install--reinstall bcmwl-kernel-source  sudo modprobe wl

Open a terminal, which in turn runs the above command.

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ThinkPad e431/e531 ubuntu 14.04 Install wireless card driver