Setting up Proxy Settings on Debian

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http://unix.stackexchange.com – During installation of Debian I was asked for a Standard Proxy String in the form of http://user:password@host:port/, which I entered. apt-get ran and retrieved files during update, and now Debian is installed. However, when I tried running sudo apt-get install ..., I get an error message containing the message Could not resolve proxy_host where proxy_host is the host I entered during installation. Are there other places where I have to set up the proxy information? (HowTos)