I used ubuntu for several months before the update came around and ever since then my wifi has been unable to connect (let alone i can not see any available connections either). I have read everything online and followed all the code that everyone has advised yet nothing seems to work. somebody save me before i whack this computer. any suggestions are great ones
I'm using the same LapTop (Dell Inspiron 1440) and I had the same problem, and used many ways but with no luck. Until I found this post. http://www.mindwerks.net/2012/06/wireless-bcm4312-with-the-3-4-and-3-5-kernel/
But I modified the last step a little.
After running "make" in terminal, I followed this step using the Readme file from this address: http://www.broadcom.com/support/802.11/linux_sta.php
And if you encountered an error, this README file has solutions for a couple of them.
I had problem with my dell laptop and wifi almost in all releases after 10.04. My solution was to use another network to update my drivers. However, last time, I followed the instruction of this post and it worked. Checked it out: