[ubuntu] Disable Proxy?

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http://ubuntuforums.org – Hi, how can i disable ANY Proxy Settings i made? I have the problem that i only have the console open. NO GUI! Now i want to run apt-get to make updates. But the problem is that i had proxy settings which are wrong. Apt-get says something like Something wicked happened resolving *adress:port* (-5- No address associated with hostname). I only need to deactivate all proxy settings so i am able to use the network :-(. Or at least the proxy settings for apt-get... can someone help please ? [UBUNTU 11.10] (Hardware)