I do a fresh install on my computer of kubuntu 9.10; during the live cd session, wireless lan (rt73usb) was working fine, but after the instalation, the wireless card is displayed on the network manager and can scan near networks, but can't connet to my wireless network.

Is my work computer, and I can't have a wired network, we only have wireless, please your help, I have to work on windows until I get this working.

What can be failing?

Thanks for your help