Cannot connect to wireless network with a Broadcom BCM4311 802.11b/g WLAN card

Question

I installed ubuntu on my old HP. it is the 11.10 version. I cannot find out how to connect it to my wireless network. I can't even get it to scan for available networks.

Link to my pastebin: http://pastebin.com/ZJS9y6Vq

Answer 1

OK, I will try to keep the terminal to a minimum because you are new to linux, but trust me it is a wonderful tool once you get used to it.

First we need to determine if Ubuntu 'sees' your wireless card. This is kind of like drivers in windows, except they are called kernel modules. Open a terminal (either by the unity menu or by pressing CTRL+ALT+T) and type this:

username@computer:~$ sudo lspci -v
[sudo] password for username: <type your password here>

Then copy all the output and paste it to a pastebin so that we can see if the correct kernel module is being used.

If it turns out to be the wrong one, you will either need to check out which one to insert (insmod) or check out a tool to 'wrap' the windows driver into a linux compatible version (ndiswrapper).

Answer 2

I have a Vostro 1000 with the same wireless card and I found that Ubuntu detects the card but does not install the correct drivers.

Use lspci command to display the details about hardware. It will display all of PCI connected hardware. Look the information for wireless card in the list, the match must be with this identifier [14e4:4312]. If the identifier is another you can try with Synaptic which I explain further.

$ sudo lspci -v
05:00.0 Network controller: Broadcom Corporation BCM4311 802.11a/b/g (rev 01) Subsystem: Dell Wireless 1490 Dual Band WLAN Mini-Card Flags: bus master, fast devsel, latency 0, IRQ 18 Memory at c0200000 (32-bit, non-prefetchable) [size=16K] Capabilities: [40] Power Management version 2 Capabilities: [58] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [d0] Express Legacy Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting Capabilities: [13c] Virtual Channel Kernel driver in use: b43-pci-bridge Kernel modules: ssb

$ sudo lspci -nn
05:00.0 Network controller [0280]: Broadcom Corporation BCM4311 802.11a/b/g [14e4:4312] (rev 01)

To solve the problem install the correct driver for this wireless card and remove the incorrect driver (bcmwl) which Ubuntu installed by default.

$ sudo apt-get update
$ sudo apt-get install firmware-b43-installer 
$ sudo apt-get remove bcmwl-kernel-source 
$ sudo reboot

And I had the wireless card working again! Because I upgraded the Ubuntu version and with the last it worked fine after installation.

Or if you prefer, it can be done with Synaptic by

• getting the b43-fwcutter, firmware-b43-installer

• uninstalling the bcmwl-kernel-source (installed by default)