Ubuntu 11.04 and wireless connectivity problem

Wireless connection worked absolutely fine with the Broadcom STA driver on my lenovo machine - i386 until I upgraded to 11.04 when the natty narwhal's wireless connection became actually notorious! ;)
What finally worked for me to get the wireless connection working, Thanks to Eric Moon, is this. The last answer here did the trick.

I was getting the network UNCLAIMED status with

$sudo lshw -C network

PCI (sysfs) 
  *-network UNCLAIMED    
       description: Network controller
       product: BCM4311 802.11b/g WLAN
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:04:00.0
       version: 01
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: latency=0
       resources: memory:f0000000-f0003fff
  *-network
       description: Ethernet interface
       product: NetLink BCM5906M Fast Ethernet PCI Express
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:06:00.0
       logical name: eth0
       version: 02
       serial: 00:1e:ec:96:04:3d
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.116 duplex=full firmware=sb v3.04 ip=192.168.1.8 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:44 memory:b8000000-b800ffff

and with

$ sudo iwconfig 
lo        no wireless extensions.

eth0      no wireless extensions.

Thus I connected to a working wired connection and installed the missing piece of two softwares, namely, firmware-b43-installer and b43-fwcutter; after deactivating the current Broadcom STA driver under Shortcuts->Additional Drivers, section.

Then running the following command activates the newly installed driver:

$ sudo modprobe b43

Still I did not get the wireless lit up as indicated in the post there, and that was because the wireless was not active in my laptop. In my lenovo machine FN+F5 is the shortcut to turn on/off the wireless. So that combination got my wifi finally up!
Now on executing:

 $ sudo lshw -C network 

no UNCLAIMED network was reported...
Also,

$ sudo iwconfig

stated a wlan0 connection!!