No wired and wireless connection found after upgrading 12.04

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http://askubuntu.com – After upgrading 12.04 LTS, my wired connection works but no wireless connection found. I tried many suggestion for wireless connection on Ubuntu forum but nothing works for me. Now, maybe by mistake, I am also unable to connect Internet through wired connection. Now, (1) its says "No network devices available" and (2) in System Settings → Hardware → no additional driver icon is showing Please help. I don't know much about Ubuntu. (HowTos)