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I have a gateway NV74 with AR928X Wireless Network Adapter (PCI-Express) on Ubuntu 9.10. Wireless doesn't work that well, the connection is bad, and system disconnects itself often. Also, sometimes the machine crashes, and I have to reboot the computer. Any ideas please?

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up vote 0 down vote accepted

try to install these two packages.

linux-backports-modules-karmic-generic.
linux-backports-modules-wireless-karmic-generic.

and you should take this Wireless Trouble Shooting Guide. and Take a look at WiFiHowto and WiFiCard Supported

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