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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?

Pilot6
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Kahumuza Benon
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  • Recommend you to check similar issues ex: here – Ege Sucu Mar 13 '17 at 11:29
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    @Egrimo The question you linked doesn't have any answer :/ – M. Becerra Mar 13 '17 at 11:31
  • Try running from terminal systemctl restart network-manager.service – M. Becerra Mar 13 '17 at 11:32
  • b@b-HP-Notebook:~$ systemct1 restart network-manager.service systemct1: command not found – Kahumuza Benon Mar 13 '17 at 11:45
  • the above line is the result – Kahumuza Benon Mar 13 '17 at 11:45
  • @M.Becerra Hmm. A 3 year old question with no answers - might as well get rid of it! –  Mar 13 '17 at 11:49
  • I would guess that you are missing a driver for your wifi card. Can you look at additional drivers (it's a GUI program, so just type this in the menu and you should find it) or run ubuntu-drivers devices in a terminal and show the output? – Sethos II Mar 13 '17 at 12:03
  • this is the result @ Sethos II – Kahumuza Benon Mar 13 '17 at 12:14
  • == /sys/devices/pci0000:00/0000:00:02.4/0000:01:00.0 == model : BCM43142 802.11b/g/n vendor : Broadcom Corporation modalias : pci:v000014E4d00004365sv0000103Csd0000804Abc02sc80i00 driver : bcmwl-kernel-source - third-party non-free

    == /sys/devices/pci0000:00/0000:00:01.0 == model : Kabini [Radeon HD 8240] vendor : Advanced Micro Devices, Inc. [AMD/ATI] modalias : pci:v00001002d00009838sv0000103Csd00008137bc03sc00i00 driver : fglrx - third-party non-free driver : xserver-xorg-video-ati - distro free builtin recommended driver : fglrx-updates - third-party non-fr

     – Kahumuza Benon Mar 13 '17 at 12:14
  • You typed it wrong, it's an lowcase L not a number 1, copy and paste it, to be sure. – M. Becerra Mar 13 '17 at 12:14
  • systemctl command is not found @ M. Becerra – Kahumuza Benon Mar 13 '17 at 12:20

4 Answers4

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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!!

Thomas
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rahul ranjan
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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.

Sethos II
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  • b@b-HP-Notebook:~$ sudo apt-get install bcmwl-kernel-source [sudo] password for b: Reading package lists... Done Building dependency tree
    Reading state information... Done bcmwl-kernel-source is already the newest version. The following packages were automatically installed and are no longer required: kde-l10n-engb libisl10 linux-image-extra-4.4.0-31-generic linux-signed-image-4.4.0-31-generic linux-signed-image-generic-lts-xenial Use 'apt-get autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 75 not upgraded.     – Kahumuza Benon Mar 13 '17 at 12:50
  • thats the result @Sethos II – Kahumuza Benon Mar 13 '17 at 12:50
  • The correct driver seems to be installed. Did you reboot after installing it? – Sethos II Mar 13 '17 at 13:26
  • i did reboot @ Sethos II – Kahumuza Benon Mar 13 '17 at 13:36
  • What is the exact response to the terminal command: sudo modprobe wl? Also, please edit your question to add the result of the terminal command: lspci -nnk | grep 0280 -A2 – chili555 Mar 13 '17 at 13:41
  • b@b-HP-Notebook:~$ sudo modprobe wl modprobe: FATAL: Module wl not found. – Kahumuza Benon Mar 13 '17 at 13:58
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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.

anonymous2
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bzipitidoo
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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

Ravexina
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Kahumuza Benon
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