Ubuntu 14.04 Fresh Installation: Wi-Fi Issue

This was long pending...

So, I once again thought of getting serious with my Linux skills and installed Ubuntu 14.04.2 LTS on my Dell Latitude D830.

After the fresh installation, I was not able to:

• See the Wi-Fi icon blinking on my laptop
• See the "Wi-Fi Networks" in the network list
• Connect to the any Wi-Fi network

After spending many days and 2 nights, a small five-liners helped from this post.

sudo apt-get remove --purge bcmwl-kernel-source
sudo modprobe -rf b43
sudo modprobe b43

sudo iw reg set GB
sudo sed -i 's/^REG.*=$/&GB/' /etc/default/crda