[ubuntu] not able to browse using firefox ubuntu 12.10

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http://ubuntuforums.org – i faced this a couple of times - i have dual boot windows 8 and Ubuntu - trying to learn as i can to get away from windows now i can ping from Ubuntu my wired connection is working i have a good IP, but i can not browse using Firefox i checked my proxy and nothing is there - i am not using a proxy what could be the prob no i restarted to check the INTERNET on the windows - working fine - i rebooted back to Ubuntu - not working i added a manual dns - Google not working - i just kept trying and suddenly it worked ! what is going on (Hardware)