No Wi-Fi adapter found

Question

“No Wi-Fi adapter found” is the message I got after installing Ubuntu 17.10.

With the following command line lspci -nnk | grep -iA3 net, I got the following message. How could I fix that issue?

Here is the error shown in the settings:

Answer 1

I had the same problem.

Then, looking for several places I solved following the below steps.

First of all, I tried to download the network kernel from site --> https://ubuntu.pkgs.org/17.10/ubuntu-restricted-amd64/bcmwl-kernel-source_6.30.223.271+bdcom-0ubuntu3_amd64.deb.html

If your architecture is x64,

sudo dpkg -i bcmwl-kernel-source_6.30.223.271+bdcom-0ubuntu3_amd64.deb
sudo apt install -f

Then, I saw the configuration of network service

 cat /etc/NetworkManager/NetworkManager.conf 

By default, there are

 [main]`
 plugins=ifupdown,keyfile

 [ifupdown]
 managed=false

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

if it is different of yours, change it.

Then, you need to restart the kernel configuration.

  sudo service network-manager restart

Reboot the computer.

On bios, change the boot secure:

boot secure: disabled   ->    boot secure: enabled

And ok.

Works in ubuntu 17, Positivo Stilo XCi7660.

bye

Answer 2

The wifi hardware adapter is not shown in your output. I only see LAN adapters.

It is difficult to provide a solution with this information.

1. Open the network connection manager and ensure "Enable Wi-fi" is ticked" https://i.stack.imgur.com/6v7Am.jpg

2. Open a Terminal Window and run this command to see if it is recognized by NetworkManager. You should see, amongst others, a device of type "wifi" in that list, if not then your wifi-card/device is not enabled on your computer.

$ nmcli device status

DEVICE      TYPE      STATE        CONNECTION
...
wlp2s0      wifi
...

What is the output on your computer?

2. Are you also connected to the Internet via the LAN? Try ping -c3 www.google.com

3. Is it in this list?

$ ip address show

4. Perhaps it is disabled in the BIOS UEFI?