Ubuntu14.04 system cannot connect to Wi-Fi network and install BCM43142 card driver solution

1. Description of the problem

Bo Master recently began to learn Ros, the first must install Linux operating system, the choice is Ubuntu14.04, the installation process skipped, directly talk about the problem. After installing the system, I found an important problem, unable to use Wi-Fi, only use the wired network, and the network connection list does not show the wireless network at all, only a "wired connection 1". The problem description is complete.

2. Solution

Simple but easy to ignore problems!
The blogger thought it was a NIC driver, studied for the drive for a whole day, and finally found that the problem was simple: secure boot was not disabled. If you determine that your network card driver has no problems, then you may just need to disable secure boot (disabled) in the BIOS.
NIC driver not installed or not installed successfully
This article is mainly for BCM43142 network card driver, mainly because this model of the network card is very old, the rest of the network card driver can be found on the Internet generally.

Install the network card driver need to understand the network card type, with the LSPCI command view, My network card is:
Broadcom Corporation BCM43142 802.11b/g/n (rev. 01)
This network card is a very old network card, has been rarely used, so the drive is very difficult to download. Tried a lot of ways, and finally found on the following online:

http://askubuntu.com/questions/175104/how-do-i-install-bcm43142-wireless-drivers-for-dell-vostro-3460-3560

Open the terminal and execute the following instructions one by one:

sudo apt-get install linux-headers$ (uname-r | grep-po "\-[a-z].*") sudo apt-get install build-essential dkms sudo apt-ge T install dpkg sudo apt-get install Bcmwl-kernel-source

At this point, the problem should be resolved.

Ubuntu14.04 system cannot connect to Wi-Fi network and install BCM43142 card driver solution