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Recently I installed Ubuntu 17.04 in my Dell laptop, but WiFi does not work in Ubuntu (It works well in windows 7). I have already tried the following steps, but no luck. 

sudo -H gedit /etc/NetworkManager/NetworkManager.conf

At the bottom of this file, copied and pasted the following:

[device]
wifi.scan-rand-mac-address=no

then

sudo service network-manager restart

Output of lspci -nn -d 14e4

06:00.0 Network controller [0280]: Broadcom Limited BCM43142 802.11b/g/n [14e4:4365] (rev 01)

Output of iwconfig

lo        no wireless extensions.
enp7s0    no wireless extensions.

How to solve this issue?

Sumeet Deshmukh
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Krishna
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1 Answers1

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It seams like you should install a chipset

try this first :

sudo apt-get install bcmwl-kernel-source

If it is still not working you may have your "secure boot" activated in your BIOS

reboot the computer and type delete several time (or f2 in some cases(should have a clue somewhere))

once in the BIOS find an option called "secure boot" and deactivate it

then save and reboot

if it still not working you may have a look to what is called "additional drivers" in your system settings->software sources

or try again

sudo apt-get install bcmwl-kernel-source

hope this help

Vimman
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  • If you reactivate Secure Boot, the driver will stop working. – Pilot6 Apr 30 '17 at 09:04
  • After executing the command "sudo apt-get install bcmwl-kernel-source", wifi is working now for me. But I have tried the same command yesterday, but wifi was not working that time, not sure why its happened. – Krishna Apr 30 '17 at 16:23