No wifi Internet with Ubuntu 12.04

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http://askubuntu.com – Im with Ubuntu 12.04 - Dell Inspiron 5110 (8g ram, i7 cpu). When I connect to a router at my place, i get an internal IP i can ping others in the network (and the router), but have no internet. I trided by checking with trough FF, IE and Opera and couldn't load any pages. I read all other similar topics and nothing helped. (HowTos)