Ubuntu 12.04 LTS stopped detecting BCM4312 on DELL E6500

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http://askubuntu.com – I have been using wireless seamlessly since I upgraded to Ubuntu 12.04 LTS. I did a botched attempt of installing Octave 3.6, at that time I was connected via Ethernet. I postponed that installation till later, but when I went home and tried to connect to a wireless network realized that Ubuntu is not detecting the wireless adaptor..the blue light did not come up even after toggling hardware key. On booting into windows OS I was able to confirm that the adopter is working and I could connect to wireless network. Since then I have tried a number of things including re-installing BCM drivers as (HowTos)