Comment 3 for bug 22814

apt doesn't give tasksel information at any finer granularity than what's already displayed (and, come to that, nor does dpkg give apt anything better). It's not clear to me how you could do a lot better in any vaguely generic way if it's a postinst running something that takes a while. To be honest, I think the best long-term fix is to make packages install more quickly ... dpkg triggers would help with that.