No option to enable wifi ubuntu 14.04

Question

I'm running Ubuntu 14.04 64-bit on a laptop but cannot enable wifi.I then ran ubuntu 16.04 on a USB and the wifi option appeared but the next time i ran it, the wifi option didnt appear.

Enable networking option is the only one in existence.

The command below produces the result shown

b@b-HP-Notebook:~$ lspci -nnk | grep 0280 -A2
01:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
    Subsystem: Hewlett-Packard Company Device [103c:804a]
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136] (rev 07)

What can I do?

Answer 1

There may be chances that your system may be missing some wifi drivers so try to follow below command -

sudo apt-get install bcmwl-kernel-source

(Install the package listed by ubuntu-drivers device via above command)

and reboot . P.S. -To download above package try to connect internet via thethring.(eg mobile phone) Hope this helps!!

Answer 2

Based on your output of ubuntu-drivers device I would say you are missing the driver for your wifi card. Install the package listed by ubuntu-drivers device:

sudo apt-get install bcmwl-kernel-source

and reboot. Afterwards the wifi card should be recognised.

Answer 3

On one of my systems, there's no problem with missing drivers, only the networking icon is missing from the taskbar. I can open a terminal and run:

sudo nm-applet

That works around the problem. Then I can click on the icon, view the list of wifi networks, choose one, set it up, and use it.

Answer 4

I installed updates from the software updater and now I can access the option for enabling Wi-Fi.To everybody for your contributions @ Sethos II @ M. Becerra @ chili555