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?
Setting up Proxy Settings on Debian
debian;proxy;http proxy