[ubuntu] ubuntu 10.04 wireless problems

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http://ubuntuforums.org – Hi all I cannot get wireless working at all on my laptop i have acer extensa 5235 running 10.04 i never had problems till i had to try using a windows server then all hell broke loose Under network connections my network shows up but it cannot connect under iwconfig i get lo no wireless extensions etho no wireless extensions wlano IEEE 802.11bgn ESSID:off/any Mode: managed Acess Point: Not associated Tx:Power=20dbm Retry long limit:7 RTS thr:off Fragment thr:off Powermanagement : on your help would be greatly appreciated as i will never go back to windows so its either fix it or go cav (HowTos)