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I am using 14.04.4 and after when I update my software via software updater I cannot see my wifi connections after a reboot. I used dual-boot with windows and secure boot is turned on. Secure boot was enabled at the first place and I don't want to turn it off. How can I address this problem? I am using Broadcom BCM43142 adapter.

ashwani
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  • What is the result of the command: sudo modprobe wl? – chili555 Jul 28 '16 at 00:22
  • required key not found – ashwani Jul 28 '16 at 00:45
  • Please see: http://askubuntu.com/questions/762254/why-do-i-get-required-key-not-available-when-install-dkms-modules-or-after-a-k/762255#762255 – chili555 Jul 28 '16 at 00:46
  • So, is there no other way except disabling secure boot? – ashwani Jul 28 '16 at 00:57
  • I'd certainly try the mokutil method first. – chili555 Jul 28 '16 at 01:31
  • Aren't both the methods identical? How mokutil method is different? Please explain. – ashwani Jul 28 '16 at 02:40
  • @chili555 Please explain I am new to linux and thus need your help – ashwani Jul 28 '16 at 13:23
  • The mokutil method allows your Ubuntu partition only to boot in insecure mode. Disabling secure boot in the BIOS (UEFI) allows both Windows and Ubuntu to boot in insecure mode; an alternative I gather you do not wish to pursue. It is not without its own issues, however: https://bugs.launchpad.net/ubuntu/+source/mokutil/+bug/1600615 – chili555 Jul 28 '16 at 13:25

2 Answers2

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The actual reason is during the upgrade it removes some packages in ubuntu. One of the package might be the WiFi driver of the system. So, what I did in this situation is I visited the Ubuntu community documentation page which details all about WiFi drivers.

Follow the documentation guide if this did not work

This instruction is for Broadcom only

To identify the wifi driver type the following command

  • If it's an Internal card

    lspci -vvnn | grep -A 9 Networ

  • If it's an USB card

    usb-devices

Now you have to download the driver from the documentation page and extract  the folder inside the package to the desktop. Then open the folder. In the folder right click on the window showing the WiFi driver content and click "Open in terminal". Then you have to type the following command below in order. 

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

Now you're done. Check if the WiFi works.

mxdsp
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Mohamed Hussain Ibrahim
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I used "BLOG SLONIA" from POLAND For ubuntu 12.04-14.04 thanks

Run the terminal and type:

Sudo passwd

We give the root password, then:

Su

Command prompt:

Apt-get update

Apt-get remove bcmwl-kernel-source

The problem is confirmed by Y enter. After unpacking the package and removing the dkms module, we include:

Apt-get install the firmware-b43-installer

Apt-get install b43-fwcutter

Modprobe b43

Ifconfig wlan0 up

And finally we restart the system with the command:

Restart

After restarting our computers is what we need

E.T. Laski
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