Hi, was there any errors when you ran the commands I gave you? It should have worked but I figure there is a conflict because of all the other methods you have tried.
sudo apt-get purge --remove firmware-b43-installer firmware-b43legacy-installer firmware-b43-lpphy-installer
Download the b43 zip file to a flash drive then drag and drop the file to your ubuntu desktop. Right-click it and select Extract Here. Open a terminal and do:
if it still does not come on then delete the text info file in your home folder and run the script again and attach the file here so we can see what condition your wireless is in after the changes.
sudo mv b43/* /lib/firmware
sudo rmmod -f b43
sudo rmmod -f ssb
sudo modprobe b43