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Ubuntu on MacbookPro: how to get a support for 802.11a/n (5GHz) with chip broadcom 4331?

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http://askubuntu.com – I have been having problems with N mode. When I execute iwconfig get wlan0 IEEE 802.11b/g and when I boot in Mac os my wireless card info is : Firmware Version: Broadcom BCM43xx 1.0 5.100.198.104.5) Supported PHY Modes: 802.11 a/b/g/n And I am able to connect to N mode wireless network. But on ubuntu, this has been a problem for me when trying to connect to access point with phy mode N. After some research I found on the linux wireless documentation that 802.11a/n (5GHz) modes and power management are not yet supported HT phy cards (4331) Is there a way to get it to work? (HowTos)