I installed 23.04 and my wifi adapter is not being found. It worked yesterday in 20.04. How do I fix it?

Question

I installed 23.04 today and my wifi adapter no longer works. Anybody know how to fix it?

jackstand3@jackstand3-Inspiron-530:~$ lspci -nnk | grep 0280 -A3
03:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4321 802.11a/b/g/n [14e4:4328] (rev 03)
    Subsystem: Dell Wireless 1500 Draft 802.11n WLAN Mini-card [1028:000a]
    Kernel driver in use: b43-pci-bridge
    Kernel modules: ssb
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 002: ID 1d57:0016 Xenta 
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 003: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser
Bus 005 Device 002: ID 413c:2105 Dell Computer Corp. Model L100 Keyboard
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Please edit your question to show the result of the terminal commands: lspci -nnk | grep 0280 -A3 and: lsusb Welcome to Ask Ubuntu. — chili555, Apr 20 '23 at 20:14
Does this answer your question? My wireless/WiFi connection does not work. What information is needed to diagnose the issue? — waltinator, Apr 20 '23 at 21:16
I experienced the same problem after upgrading to Ubuntu 23.04. In my case the problem was solved by installing backport-iwlwifi-dkms Hope this helps. — Arnold Greving, Apr 23 '23 at 08:23

score 2 · Answer 1 · answered Apr 20 '23 at 22:22

The upgrade will not install proprietary firmware files, namely those needed for your Broadcom device. With a working internet connection by ethernet, tethering or whatever means possible, open a terminal and do:

sudo apt update
sudo apt install firmware-b43-installer

Reboot. You should be all set.

score 0 · Answer 2 · answered May 02 '23 at 17:37

Hoping your issue is resolved but if not, I noticed that 23.04 installed a dkms installation of the Broadcom driver which when installed on my MacBookPro didn't work. However what did work is after installing, the initramfs needed re-building. So sudo update-initramfs -u and with any luck you are good to go!

score 0 · Answer 3 · answered May 08 '23 at 12:07

0

I resolved this by installing backport-iwlwifi-dkms

sudo apt update
sudo apt install backport-iwlwifi-dkms

answered May 08 '23 at 12:07

Agoun Juba

1

2

I don’t believe this will solve a Broadcom issue. – chili555 May 08 '23 at 12:48

score -1 · Answer 4 · edited Jul 11 '23 at 12:23

-1

The wifi should just work if you do NOT enslave wifi interface to any bridge in your /etc/netplan/xxx file. In other words the following fragment in that file cannot work.

 ......
   br0:
      - wlan0

Ubuntu Linux is known to not support bridging wifi interfaces, so the following simple example should work:

network:
   version: 2
   renderer: networkd
   ethernets:
      wlan2:
         dhcp4: yes
         dhcp6: yes

After you change this file run:

sudo netplan generate 
sudo netplan apply

...and you should be good to go.

edited Jul 11 '23 at 12:23

karel

114,770

answered Jul 06 '23 at 19:40

Scuric Goran

1

found a better solution on the internet (just edited for clarity): – Scuric Goran Jul 18 '23 at 01:41

I installed 23.04 and my wifi adapter is not being found. It worked yesterday in 20.04. How do I fix it?

4 Answers4