Comment 7 for bug 820514

This is utter madness. You can't just haphazardly select something to execute based on the fact that a package is installed. If the rest of the system worked that way, people would never get proper pagers, browsers, mail clients, etc, etc, etc when in terminals, if they just also happened to have a GUI client installed.

We use the default ubuntu live seeds (and there's no reason we should need to fork to remove one package), but we install from the text/debconf frontend. I see no reason why this shouldn't work, just because another package happens to be installed.