trouble in sudo apt-get update
I have just installed Ubuntu 10.10...when I type in sudo apt-get update in the terminal, it flags an error 407: Proxy Authentication Required. My internet connection requires a proxy authentication, that I have already provided (and I'm able to connect to the net via a web browser). I have also configured the proxy in Synaptic...the error message still remains the same.
sudo apt-get install build-essential says E: unable to locate package build-essential.... I need these two commands to get started...please help.