Just installed natty. When running the Live session the wireless was working perfectly. After installation however, it doesn't work at all. There is an option to install the Broadcom Restricted drivers, but when I click activate, I just get a "jockey" error, pointing me to /var/log/jockey.log.
This is what that file contains:
2011-04-30 11:31:15,648 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted
2011-04-30 11:31:15,686 DEBUG: XorgDriverHandler(%s, %s).enabled(): No X.org driver set, not checking
2011-04-30 11:31:15,849 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted
2011-04-30 11:31:15,884 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted
2011-04-30 11:31:15,918 DEBUG: XorgDriverHandler(%s, %s).enabled(): No X.org driver set, not checking
This is the only issue I'm having with Natty, I'm hoping someone can help me fix this (if it's not a bug).
I have the same wireless network card; i.e. "Broadcom Corporation BCM4311" (possibly your model may be different, which can be determined by "lspci -vvnn | grep 14e4" command in the terminal), and the same problem (no wireless connection, even I cannot see the list of wireless networks) after the 11.04 upgrade.
My problem is solved after removing "bcmwl-kernel-source" by using Synaptic Package Manager, then installing "firmware-b43-installer" and "b43-fwcutter" again by Synaptic Package Manager. I hope it solves your problem, too.
WiFi not working (Broadcom BCM4311 )
Bug report is here.
Wireless + Linux has a long long way to go.
You should submit a bug report. The more reports the quicker something will get done (in theory).
In the meantime you can experiment with blacklisting modules and downloading a driver from Broadcom's website directly.