[kubuntu] Unable to connect to a wireless network.

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http://ubuntuforums.org – I'm unable to connect to a wireless network at home. On my other OS (which is sadly Windows Vista) i can connect to it without a problem. The network is encrypted by WEP with a 13 character key. I don't understand why I cannot connect to it under my Linux. Also I've succesfully connected to another network at my girlfriend's house which was protected by a 10 character password, without a problem of any kind. What should I do? (Hardware)