WiFi problem after Ubuntu 12.10 update

Question

I just updated my Ubuntu 12.10 today and it went fine and I was told to restart system and after I restart my WiFi stopped working. Mine is Broadcom BCM4312 card . It was working fine just before the update, I tried reinstalling driver from software sources and it didn’t work, it shows the proprietary driver in use but network manager doesn’t detect my WiFi card.

I cant answer it my reputation is too low to answer the question before eight hour.
This link might help others with bcm43 series cards

http://lkubuntu.wordpress.com/2011/09/08/how-to-fix-broadcom-43xx/ — Rohith Raveendran, Oct 24 '12 at 14:36

score 12 · Accepted Answer · edited Feb 22 '13 at 23:54

I just fixed the issue, I found the kernel sources has not been installed which prevented from compiling the driver properly. So I installed kernel source for the current kernel from Synaptic then issued the following commands and my WiFi was instantly restored (like 3 or 5 seconds).

To install kernel headers and source:

 sudo apt-get install linux linux-headers-generic kernel-package

 sudo apt-get purge b43-fwcutter firmware-b43-installer firmware-b43-lpphy-installer firmware-b43legacy-installer bcmwl*

 sudo apt-get install b43-fwcutter firmware-b43-lpphy-installer bcmwl*

Then reboot.

This applies to BCM4312 only (My laptop is Lenovo g450)

For others can see this blog post, this might be useful for you.

score 2 · Answer 2 · edited Feb 22 '13 at 23:54

2

I too had faced this issue. I connected it to wired lan and I again ran apt-get upgrade and restarted, then it started working.

I feel this is the worst installation upgrade from Ubuntu.

edited Feb 22 '13 at 23:54

BuZZ-dEE

14,223

answered Oct 24 '12 at 10:51

Pritesh Jain

183

3

Indeed it does :( – faken Oct 25 '12 at 22:16

score 1 · Answer 3 · edited Feb 22 '13 at 23:54

1

sudo apt-get install bcmwl-kernel-source

I had same problem, with this everything will be fine.

If didn't install try first:

sudo apt-get remove bcmwl-kernel-source

edited Feb 22 '13 at 23:54

BuZZ-dEE

14,223

answered Oct 24 '12 at 10:54

score 1 · Answer 4 · edited Feb 22 '13 at 23:54

1

Check /etc/resolv.conf I was also facing the same issue as loopback address was there as my DNS preference. If this is the case, then correct the dns address to resolve issue.

edited Feb 22 '13 at 23:54

BuZZ-dEE

14,223

answered Oct 24 '12 at 11:24

Vijay Parashar

11

score 0 · Answer 5 · answered Oct 24 '12 at 11:05

0

Go to Dash -> Software Sources -> Additional Drivers -> Using Broadcom 802.11 Linux ...

answered Oct 24 '12 at 11:05

balki

2,240

WiFi problem after Ubuntu 12.10 update

5 Answers5

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