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[lubuntu] Very unstable wifi connection after upgrade to 12.04(Atheros AR9287)

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http://ubuntuforums.org – my laptop is acer aspire 4743G, wireless connection is ok for windows 7; used to be ok for ubuntu 10.04, and very instable after an update to 12.04. And the wifi problem only happens at home... $ lspci -nn | grep 0280 05:00.0 Network controller [0280]: Atheros Communications Inc. AR9287 Wireless Network Adapter (PCI-Express) [168c:002e] (rev 01) could you help me? :):) I am so distressed that I am thinking of buying mac for paid linux... (Hardware)