I have installed Ubuntu 17.10 on my notebook. However, I cannot connect to wi-fi because there is a "No Wi-Fi Adapter Found" message.

I don't have any idea what to do next.

  • My notebook : Asus X555LN-XX507H
  • Network Adapter : Broadcom 802.11n

(This is a follow-on from my earlier post, Kali Linux / No Wifi Adapter found, where I was advised to try an easier system than Kali.)

  • 1
    Which version of Ubuntu are you using? What is the output from lspci or lsusb that defines the network adapter? (Both of these need to be added to your question.) – roaima Jan 10 at 19:15
  • Im using Ubuntu 17.10 I will add output from lspci and lsusb when I will have time – greed Jan 10 at 19:49
  • Welcome to U&L , please update with the output of lspci -knn | grep Net -A3 – GAD3R Jan 11 at 10:30
  • Does it output different line than BCM43142 (14e4:4365) ? – greed Jan 11 at 19:23
  • @greed The answer proposed by Ales_Krud should work for you on Ubuntu , but it will not work for Kali-linux . – GAD3R Jan 15 at 15:14

Just connect using usb cable to do usb tethering, open terminal by Ctrl+Alt+T and type:

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

Then, reboot.

  • 1
    This helped me fix the problem on my machine. – gented May 25 at 23:09
  • 1
    This didn't work for me in my ubuntu 17.10. I also tried to disable the secure boot in my bios but didn't have luck. As of now only ethernet cable works for me but when I try to use wifi connection I can't – jaaayz Aug 26 at 14:53
  • thank you very much, this did work on my macbook air 2017 – Sam Oct 15 at 9:44
  • This solution works on dell precision m4800 – TuyenNTA Nov 3 at 12:14
  • On a fresh install you might need to run sudo apt update before trying to install anything. – ubershmekel Nov 14 at 8:46

A problem with Broadcom BCM43142 (14e4:4365). the problem has been known for a long time. You need to download and install the package bcmwl-kernel-source

Source: https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx

So, the issue for me was because of secure-boot, uefi and the restriction on third party libraries which would be usually required for the network devices to work.

Following Rajat's comment proved useful for me on Ubuntu 18.04

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

Reboot your OS and then follow instructions about Enrolling MUC. Once that is done, third party libraries should be able to interact with your devices and everything should work.

First, you'll need to find the exact model of the Broadcom network adapter chip your notebook has. "802.11n" is just the name of the Wi-Fi standard it supports: Broadcom has several wireless chips supporting that standard.

lspci -nn would be a good command to list all PCI(e) devices on your laptop and their PCI ID numbers: those numbers would allow a more accurate identification. lsusb will do the same for USB devices.

The lspci -nn listing line might look something like this:

12:00.0 Network controller [0280]: Broadcom Limited BCM43228 802.11a/b/g/n [14e4:4359]

Here, the numbers [14e4:4359] are the Device ID. The first part specifies the vendor (Broadcom = 14e4) and the second part identifies the device model.

The lsusb listing is a bit different, but the Device ID number is similar: 4 hexadecimal digits for the vendor id, a colon, and then 4 hexadecimal digits for the product ID.

You can check here for the Linux support status of various Broadcom chip models: https://wireless.wiki.kernel.org/en/users/drivers/brcm80211

Note that the supported Broadcom chips will need firmware: it is probably available pre-packaged in Ubuntu. If Ubuntu uses the same naming scheme as Debian, the firmware package name should be firmware-brcm80211.

With a bit of luck, installing this firmware package and rebooting might be enough to get your Wi-Fi functional if the necessary driver is already in kernel.

  • BCM43142 14e4:4365 but there is nothing like that on the site. – greed Jan 10 at 23:48

Installed Ubuntu 18.04 on an old Dell computer and got the same message (no wifi adapter found) when trying to connect to the internet. Tried some of the solutions proposed here and in other postings, none of which worked. Decided to re-install. During the installation there is a radial button "Install third party software for graphics and wi-fi hardware and additional media formats". The default is that this is not checked and so this option is not included in the default install. On the re-install, I checked this button, and after all the dust settled had no trouble connecting to the internet.

  • Didn't work for me :( – Boykodev Nov 5 at 8:54

This may be covered in other answers, still: Post UBUNTU installation and ethernet connected; 2 steps:

  1. run (sudo apt-get install firmware-b43-installer) -- reboot
  2. run (sudo apt-get install --reinstall bcmwl-kernel-source) -- reboot

Context: The drivers are proprietary components of BroadComm. Ubuntu (a non proprietary) will not be able to install the packages due to authentication failure even though they are downloaded. Hence the separate steps are to be followed to get wifi enabled. This does not get you bluetooth though. It may need another set of steps.

LINKS : https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx and previous answers.

If ethernet is not connected, download package from other machines, copy to UBUNTU machine and run.

Thanks to perror, Rajat, GAD3R and Alex.

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