That works for me!

ben@tecumseh:~$ cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.2.0-23-generic-pae 
root=UUID=ec1fde3e-cf25-49df-a729-b4e2b01281eb ro
ben@tecumseh:~$ lsmod | grep b43
b43                   342643  0 
mac80211              436455  1 b43
cfg80211              178679  2 b43,mac80211
bcma                   25651  1 b43
ssb                    50691  2 b43,b44
ben@tecumseh:~$ dmesg | grep b43
[   15.190301] b43-pci-bridge 0000:06:02.0: enabling device (0000 -> 0002)
[   15.190332] b43-pci-bridge 0000:06:02.0: PCI INT A -> GSI 22 (level, low) -> 
IRQ 22
[   15.190348] b43-pci-bridge 0000:06:02.0: setting latency timer to 64
[   16.153841] b43-phy0: Broadcom 4318 WLAN found (core revision 9)
[   16.366988] Registered led device: b43-phy0::tx
[   16.367133] Registered led device: b43-phy0::rx
[   16.370857] Registered led device: b43-phy0::radio
[   17.293844] b43-phy0 ERROR: Firmware file "b43/ucode5.fw" not found
[   17.293923] b43-phy0 ERROR: Firmware file "b43-open/ucode5.fw" not found
[   17.293995] b43-phy0 ERROR: You must go to 
http://wireless.kernel.org/en/users/Drivers/b43#devicefirmware and download the 
correct firmware for this driver version. Please carefully read all 
instructions on this website.

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https://bugs.launchpad.net/bugs/950295

Title:
  acer laptop hangs during boot process; 12.04 - b43 driver

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