While configuring Apt, installer sits at 82% with no way to skip network

When installing Ubuntu desktop on a computer with a slow Internet connection, the "Configuring Apt" stage of the installer sits at 82% while 'apt-get update' runs in the background. The user cannot see it running and therefore cannot cancel it if they know the update will take a very long time.

While having the network update during installation is quite convenient, it can also take a very, very long time for those of us who want to install first and update later. I think there should be an option somewhere in the installation that asks if the user would like to connect to the Internet to get updates/activate repositories.

For the record, the update takes about 10 minutes on a DSL line that gets 20 kB/s (~256 kbps?).