Wireless does not work anymore.

[KDE_dude]

I installed Kubuntu 12.04 a couple weeks ago, and the wireless worked fine. Today, I booted up computer and the wireless was off. I have a wireless switch on my laptop and so I flipped that on, but it still doesn't work. I have had the same problem with Ubuntu 12.04, and I have no idea what is wrong.

[Snowhog]

There was a kernel update on September 21st. Have you tried booting into the previous kernel and seeing if your wireless still works with it?

[KDE_dude]

How do I do that?

[Snowhog]

Grub's boot menu, by installed default, is 'hidden' and you don't see it when you boot. Don't really know why the packagers seem to think this is desirable, but...

Press Alt+F2 and type:

kdesudo kate /etc/default/grub

Enter your password and when the file opens make the following lines look like this:

GRUB_DEFAULT=0
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=-10


Save and close the file. Then open a console and type:

sudo update-grub2

Then shutdown/reboot and you will see the Grub menu and the entry "Previous Linux versions". Select that and you will see the previous kernels to boot from.

[KDE_dude]

Thanks, it works now.

[Snowhog]

I'd like to see the content of your /usr/src/ directory please.

ls -la /usr/src

I'm believing that you have a directory there for your wireless driver, and if so, installing the package dkms will/should prevent this problem from occurring when you get kernel updates. Installing the package won't hurt regardless.

sudo apt-get install dkms