[ubuntu] Wireless signal drops when >1m from router! Please help!

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http://ubuntuforums.org – Wifi works when I am within 1 meter of the router, but it drops as soon as I move to the other side of the room. What could be the problem? I have a new installation of Ubuntu 12.04 on a Dell Netbook, and a new Netgear DGN1000SP modem router. The same problem exists, regardless of whether I use WEP security or no wireless security protocol. By contrast, my Android smartphone gets perfect wireless signal all around the house. This seems to confirm that it is not a router issue. Also, with previous modem routers and previous versions of Ubuntu, I have received perfect wireless signal (Hardware)