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35a32c5
(Get the code!)
Despite what "everybody" says, b43 does work. What b43 does that bcm43xx does not do is look at the state of the radio-kill switch.
When you boot the system, what output is produced by the command
dmesg | grep b43
What sort of hardware does your Dell computer have to control the radio?
FYI, the driver that is loaded in response to the PCI ID of the BCM4306 is ssb. Based on the revision level of internal parts, ssb then loads b43 or b43legacy. If you want to blacklist anything, it should be ssb.
Because bcm43xx disappears from the kernel in the next release, it is worth some effort to get b43 working now, as bcm43xx will not be available when Ubuntu releases their next version.