Wifi not worrking after kernel update

wireless kernel broadcom

5,397

You installed an unsupported kernel. The driver does not build. What is the point of installing it? you could install kernel 3.19 to 14.04, or upgrade to Ubuntu 15.04.

You built mainline kernel form source. It was not a best idea for Ubuntu. Anyway you do not have to build kernels yourself. All mainline kernels are available at Ubuntu mainline kernel PPA.

The solution is to boot with the previous kernel using grub menu.

Then Upgrade your system to Ubuntu 15.04. You will get 3.19 kernel.

5,397

smedegaard

Updated on September 18, 2022

Comments

smedegaard over 1 year
I updated Ubuntu from version 14.04 to 14.10 and installed kernel v. 3.17 ,as described on this blog, to gain Display port MST support. This gave me MST support but WIFI does not not after the kernel update.
```
sudo lspci -nn | grep -e 0200 -e 0280
```
returns
```
02:00.0 Networkcontroller [0280]: 
Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter 
[14e4:43b1] (rev 03)
```
w1 is not found by modprobe
```
sudo modprobe w1
modprobe: FATAL: Module w1 not found
```
Using a WIFI dongle ( ~~wifi works with that~~ ) I've tried to do
```
sudo apt-get install linux-headers-generic
sudo apt-get install --reinstall bcmwl-kernel-source
```
The headers are installed as expected but the bcmwl kernel source does not support my kernel version
```
ERROR (dkms apport): kernel package linux-headers-3.17.1-dp-mst is not supported
Error! Bad return status for module  build on kernel: 3.17.1-dp-mst (x86_64)
```
The make.log from the attempted bcmwl install says that alloc_netdev only was given 3 arguments but requires 4, and also that it's undeclared. I'm not able to upload the make.log at the moment...

Does anybody have suggestions on how I get my WIFI back?

It turns out that I didn't have internet access with the wifi dongle after all. I'll try to reinstall the bcmwl kernel again when I have an ethernet connection.
- Jeremy31 almost 9 years
  
  What is the result of dpkg -l | grep bcmwl
- Pilot6 almost 9 years
  
  Where did you get that kernel image from?
- Pilot6 almost 9 years
  
  And it is not w1 it is wl
- smedegaard almost 9 years
  
  @Pilot6 I got the kernel from kernel.org/pub/linux/kernel/v3.x/linux-3.17.1.tar.xz And thanks for spotting the w1 / wl mistake
smedegaard almost 9 years

Thanks, I booted the old kernel version and updated to 15.04 with sudo do-release-upgrade. Got MST and WIFI now.
Rohan Bhatia over 6 years

@Pilot6 I am experiencing a similar problem, although booting with the previous kernel didn't solve my issue. I request you to take a look please - askubuntu.com/q/995494/672640.