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i have a acer extensa 5620z laptop and after installing 12.04 i noticed that it doesn't recognize it's wifi chipset (Intel® Wireless WiFi Link 4965AGN) . Do i need to install additional drivers ? if yes where i can find them ?

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disable the preinstalled driver and

sudo apt-get install firmware-b43-installer

http://www.linuxwireless.org/en/users/Drivers/b43#Supported_devices

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