Comment 2 for bug 985791

This was deliberate so that people wouldn't be bothered by apt prompting them to insert the CD. The common case, I would argue, is that people don't have physical media conveniently around for very long after the installation, and particularly on a server I'd expect the network to be much more convenient.

I'm definitely not going to change this for precise, as there is far too much risk of regression. If you want this changed for Q, a first step would be to verify that apt falls back to the network if the CD isn't inserted but the network is available without any kind of prompt.