I just installed ubuntu 14.04, but I found no wifi on it.

$ sudo modprobe -r iwlwfi
modprobe: FATAL: module iwlwfi not found


lspci -vq|grep -i wireless

I get nothing


lspci -vq|grep -i realtek

I get

03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5229 PCI Express Card Reader (rev 01)
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 07)

lspci -nn |grep -i net

I get:

04:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
05:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 07)

How to deal with this?

My laptop is a Thinkpad E431

  • 1
    Please provide some information about your wifi card. What is the output of lspci -nn | grep -i net? – Andrea Lazzarotto Aug 31 '14 at 21:12
  • @Andrea Lazzarotto hi, I've updated info, thanks – lily Aug 31 '14 at 21:25
  • Ok, there seem to be already a solution on this website. Please see this question: askubuntu.com/questions/334268/… I will mark this as a potential duplicate. If the answer in the other question doesn't help you, we will try to find another solution. – Andrea Lazzarotto Aug 31 '14 at 21:28
  • possible duplicate of Installing Broadcom Wireless Drivers – Eliah Kagan Sep 5 '14 at 0:00

Your Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] works with the Broadcom proprietary driver. Please connect with ethernet and open a terminal and do:

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

After it finishes, detach the ethernet and your wireless should be working.

| improve this answer | |
  • Since you already gave the correct solution in another question I sent the OP there. But it's good you posted here as well. – Andrea Lazzarotto Aug 31 '14 at 21:30
  • 1
    I am going to reward you with a bounty of +50 to say "THANKS" for the solution. After a lot of debugging in my new Ubuntu installation, following these steps solved the problem to me... two times on different moments of the year! : ) – fedorqui Sep 5 '15 at 13:33

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