[ubuntu] 12.10 Software Center Requires installation of untrusted packages

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http://ubuntuforums.org РI've been having major problems lately with the Ubuntu Software Center. Every time I try to install something, I get the message "Requires installation of untrusted packages" and gives me the options "ok" and "repair". If I click "ok", then the installation aborts and nothing happens. If I click "repair" I get the message "Failed to download repository information" with these details: Code: W:Failed to fetch http://security.ubuntu.com/ubuntu/di...ty/Release.gpg  Something wicked happened resolving 'security.ubuntu.com:http' (Hardware)