I have a similar problem. I posted my comments here:
http://ubuntuforums.org/showthread.php?t=1473260

I had been running Ubuntu 9.10 64-bit very successfully on my Dell 1420
laptop with a Broadcom 4328 wireless card and the proprietary drivers
(v5.60.48.36). All was well - I could login to any wireless network that
my system could detect at I could provide access info to.

I performed a clean install of Ubuntu 10.04 64-bit to this very same
system. Everything works well except that I cannot log in to wireless
systems that require a password. I can connect by hard-wire and I can
connect to 'open' systems that do not require a password to get onto the
wireless network.

I can 'see' all of the local wireless networks on my machine, but I can
only successfully login to those without passwords required. And, yes, I
am typing the passwords in correctly...

Any help here would be greatly appreciated - I'm quite mobile with my
Ubuntu laptop for work purposes.

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NetworkManager or wpa_supplicant timing out when connecting wireless
https://bugs.launchpad.net/bugs/572777
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