Comment 21 for bug 276508

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Fabrice Coutadeur (fabricesp) wrote : Re: [intrepid] [Atheros AR5211] ath5k driver inoperative, wpa_supplicant never completes connection

As stated in Bug #288148, you should install linux-backport-modules.
I installed linux-backports-modules-2.6.27-7-generic, and it's working (new driver Support for 5xxx series of Atheros)