Ubuntu Installation :: Automatically Configure Apt-get And Proxy?

I recently installed Ubuntu 9.04 and I'm having issues with apt-get and proxy configuration. Upon initial install I attempted to set the proxy configuration through the GUI and opted for the "manual proxy" configuration. Part way through entering the proxy server name I decided to use the "automatic proxy" configuration option instead. I checked this radio box and entered the URL to automatically configure the proxy information.

At this point everything seeemed to work fine. I ran "apt-get update" and, partway through the update process, I decided to abort the update by pressing control-c. Now I am unable to use apt-get to perform any updates. It gives me several errors stating it is unable to resolve "www" (which is the partial name of the proxy server I began to enter before deciding to use the auto configuration option).

No problem I thought...I'll just go into "/etc/apt/apt.conf" and change the name. Except the name in the apt.conf file is correct. I brought up "synaptic" and changed the network configuration there (as it had the same issue) and now synaptic works fine. I am also able to use the GUI Update Manager to update my system. Still apt-get update fails. Here is one of the error lines it spits out:

[Code]....