No wireless connections in linux 3.5.0-20 and onwards

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http://askubuntu.com – I am using Ubuntu 12.10 64bit. It was just fine till linux kernel 3.5.0-19. But as soon as I upgraded my system to linux 3.5.0-20, it simply stopped identifying wireless networks in network drop down menu. It continued through -21 and -22. Today only I again installed the updates and linux kernel got upgraded to linux 3.5.0-23. But to my surprise the problem continues in -23 too. Whenever I boot linux 3.5.0-19 (from boot menu advanced options) then only my system identifies the surrounding wireless networks. Please help. (HowTos)