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This question already has an answer here:

I am using an Acer Aspire 5002WLMi laptop and set up a dual boot with Windows XP and Ubuntu 12.04. Wi-Fi is working well in Windows XP, but when I start Ubuntu I will get the below error.

[ 95.514855] b43-phy0 ERROR: You must go to and download the correct firmware for this driver version. Please carefully read all the instruction on this website.

Then I followed the instructions from the below link.


But I am stuck in installing the Broadcom Wi-Fi firmware in Terminal, and it is showing this error:

E: unable to locate package firmware-b43-installer

How can I proceed?

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marked as duplicate by Luis Alvarado Jul 15 '14 at 2:17

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

How did you install it? – Mitch Jun 22 '12 at 7:35
In your case you probably have the BCM4318. Please use the duplicate question marked since it solves almost all models for the Broadcom. BTW updating to 14.04 will have less issues than 12.04. – Luis Alvarado Jul 15 '14 at 2:19

Well, you have to have an internet connection somehow. Then you need to add the software source(repositories) needed for the b43. Make sure that they look like the image below. Make sure that you have a check mark just like the image.

enter image description here

Then To install the firmware,

Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command below.

sudo apt-get install firmware-b43-installer

Another way is to open Synaptic and go to Settings > Repositories and enable as shown in the image above, and then search for b43 and install your packages.

All that of course after adding the software source(repositories)

Note: If you don't have Synaptic Package Manager installed, you can do so by clicking below.

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"sudo apt-get install firmware-b43-installer" results in the error message listed in the question. – Peter Mortensen Jun 1 '14 at 0:48
@PeterMortensen What Ubuntu release are you running? – Mitch Jun 1 '14 at 5:21

try this:

sudo apt-get install firmware-b43-installer
sudo modprobe -r wl
sudo modprobe b43
share|improve this answer
Its perhaps very useful if you explain in your answer why the OP should do this, what they should expect to happen, how to revert etc. – fossfreedom Jun 22 '12 at 12:27
The first line gives the error message listed in the question, so this answer is unhelpful. – Peter Mortensen Jun 1 '14 at 0:46

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