Comment 30 for bug 133395

http://intellinuxwireless.org/mac80211/downloads/mac80211-10.0.0.tgz
against kernel 2.6.22 is reported so solve the problem. current ubuntus mac80211 is still vanillas 8.0.2.tgz I believe...

Don't know if it is possible to deliver ubuntu linux-image/source/modules with the latest mac subsystem, since ubuntu is in beta now.