My laptop (Dell Inspiron 17R 5720) came with preinstalled Ubuntu 11.10. I removed it and installed 12.04. Now I can't find driver for wireless. Apparently, in 11.10 there was Broadcom-STA driver. But in 12.04 there is no additional drivers to install. I tried using:
First, this is a quite nonstandard setup. I am running a 3.17 kernel on 14.04 (b/c I have the crippled intel 965 video subsystem and this allows a suspend/resume).
I figured out the linux-nonfree update removed the broadcom driver and was able to reinstall the B43 driver. All good. I have a 5ghz signal at home and wanted to connect to it and the B43 driver cannot see it.