[ubuntu] 10.4 on dell vostro 1510 with BCM4312 identify networks but wouldn't connect

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http://ubuntuforums.org – Hi guys, this is a weird situation. The network manager has no problem identifying the networks around but it wouldn't connect to some of them unless I restart the computer. It always connects to my home network and to some specific public networks at coffee shops but will not connect to other networks (in my favorite coffee shop and in the university). The networks are identified with a strong signal but no connection is being established. Disabale-enable of networking/wireless wouldn't help. Btw, it dosn't matter if the networks are open or p (HowTos)