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You might have an answer already, try a fresh install of Unity.
sudo apt-get update
sudo apt-get remove unity unity-2d unity-2d-panel unity-2d-spread...
As per the Desktop Application Autostart Specification, which Ubuntu and all major desktop environments...
I found a good command which has helped me to fix my problems.
sudo iptables -F
It reset my network settings and my network started to work. I hope this would...
I finally fixed this problem by compiling and installing the latest drivers from Linux Wireless in Ubuntu 12.04, in my case the "compat-wireless-3.5.1-1-snpc.tar.bz2" package: