[ubuntu] startup process always looking for wired network

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http://ubuntuforums.org – Hi, I've recently installed ubuntu precise, the installation and update process was done using my wired network connection; after config my wireless card, eveytime i start my pc if the wired connection is not plugged I get I message "looking for network connection..." this process delays up to 4 minutes, then i boot into the X manager and after logon I get network connection through my wireless card. so my question is: how can I deactivate the looking for process of wired connection everytime I boot ubuntu precise? regards (Hardware)