[ubuntu] prroblem with my wireless

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http://ubuntuforums.org – hello every body i just installed ubuntu on my new laptop ( acer aspire 5732z) and i think i have a problem with my wireless driver using windows i can detect wireless from any room in my house with a strong signal but using ubuntu i need to be too close so my laptop can detect the wireless this is my wireless card " Code: AR928X Wireless Network Adapter (PCI-Express) and this is the installed driver ath9k i hope someone can help with this thank you (Hardware)