Using aptitude non-interactively

["Deepak, R." <masatran@research.iiit.ac.in>]

I want to run aptitude in the background and install xserver-xfree86. So I
do:
    aptitude --assume-yes install xserver-xfree86
Then I <Ctrl-Z> and use "bg".

There are two problems:
1. It continues printing the percentage completed.
2. How do I get it to ask the configuration questions at a later time?
-- 
Deepak, R. <http://research.iiit.ac.in/~masatran/>