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At work I have a Dell laptop with a Broadcom BCM94311MCG wireless card:

# lspci
...
0b:00.0 Network controller: Broadcom Corporation BCM94311MCG wlan mini-PCI (rev 01)
...
# lspci -n
...
0b:00.0 0280: 14e4:4311 (rev 01)
...

The drivers that Ubuntu installs by default were giving me lots of headaches depending on the network’s access point: on some of them the card worked OK; on some others I kept loosing the connection every few minutes, or I couldn’t connect at all. I never found out if the problem was the encryption algorithm in use, or the wifi a/b/g/whatever protocol. Bottom line is the driver worked on some networks but didn’t on some others.

A co-worker told me he had the same problem until he switched to the ndiswrapper driver, so reluctantly I tried it. It work great. :)
More info here:

• Broadcom 43xx based wireless cards the EASY way
• Configurar Wifi para chipsets Broadcom Wireless (in spanish)