Ubuntu upgrade behind firewall

I’m currently upgrading my Ubuntu-in-VirtualBox at work from Jaunty to Karmic, but at first it didn’t work at all. Update Manager got stuck when I clicked the “Upgrade” button. Due to the Big Corporate Firewall all Internet access must go through the the Enterprisey Proxy so I immediately suspected a firewall/proxy issue. However, Update Manager,… Continue reading Ubuntu upgrade behind firewall