

Then please try accessing Internet wired and wirelessly through the Belkin router. Connect the Power cable to Modem first and then the router. If not, unplug the power cable of Router and Modem leave it OFF for 30 Seconds.

I plugged my phone (Google Nexus)(it works with S3 too) to the Ubuntu System and Turned on the USB tethering option and viola I got a great wired signal and was able to browse and download stuff again from Ubuntu m/c. It struck to me that Android phones have tethering option. I needed the Internet badly (my router is in living room and my study room is far from living room and I was lazy to shop for a compatible new wireless adapter). Belkin has driver for Mac And Windows but not for Ubuntu. It worked great for Windows 7 but when I installed Ubuntu although it paired well, I didn't get good signal and would disconnect most of the times.

I bought a Belkin N150 Wireless USB Adapter. This may not be a solution to the problem but it's a work around if you have an Android phone (depends on the model and carrier restrictions too).
