If 12.04 (actually 12.04.3 I guess) is working fine for you, you can choose to install just the driver and firmware from a newer version. Here's how -
Make sure the necessary packages to compile a package are installed beforehand -
sudo apt-get install --reinstall linux-headers-generic build-essential
Download the latest backports package from here : http://drvbp1.linux-foundation.org/~...tml/backports/
Copy the downloaded tar.bz2 package to your Ubuntu desktop > Right-click it > Extract here
Open a terminal (Ctrl-Alt-T), and run the following commands to compile and install the latest driver (replace the name "backports-3.13-rc2-1" if your extracted directory has a different name) -
sudo make install
Now you need the latest firmware pack that contains the firmware that supports your wifi card. Download the latest "linux-firmware" pack from here : http://archive.ubuntu.com/ubuntu/poo...inux-firmware/
(the current latest pack is "linux-firmware_1.117_all.deb
" (26 MB download))
Install the downloaded "linux-firmware....deb" pack by double-clicking it, or by "dpkg -i <package name>" command.
Reboot and enjoy a working wifi.