Ubuntu apt-get update PROBLEM!!

So everytime I update in my terminal, I always get this problem.

So what I did is, I follow these steps taught to me by mu Ubuntu Geek Prof. :)

1. Check if there's a proxy problem, you just type this in terminal,
                    echo $http_proxy

2. Type in the terminal: sudo-i
3. Type your password
4. Then: unset http_proxy

Check again if there's a proxy running, follow step 1.