Perfect Ubuntu Server Postfix install problem

I am at step 15 on the ubuntu perfect server tutorial but when I go from

"In order to install Postfix with SMTP-AUTH and TLS do the following steps:

apt-get install postfix libsasl2-2 sasl2-bin libsasl2-modules procmail

You will be asked two questions. Answer as follows:

General type of mail configuration: <-- Internet Site
System mail name: <-- server1.example.com"

to

"Then run

dpkg-reconfigure postfix

Again, you'll be asked some questions:

General type of mail configuration: <-- Internet Site
System mail name: <-- server1.example.com
Root and postmaster mail recipient: <-- [blank]
Other destinations to accept mail for (blank for none): <-- server1.example.com, localhost.example.com, localhost.localdomain, localhost
Force synchronous updates on mail queue? <-- No
Local networks: <-- 127.0.0.0/8
Use procmail for local delivery? <-- Yes
Mailbox size limit (bytes): <-- 0
Local address extension character: <-- +
Internet protocols to use: <-- all"

Insted of being asked the questions laid out above I get this message instead

"/usr/sbin/dpkg-reconfigure: postfix is broken or not fully installed."

Anyone have any ideas on this?

 

When was the first time you noticed that apt threw this error at you?

 

It gave me the error on install. I have been told to re-install it from a friend but I dont know how to uninstall it first.

 

What's in /etc/apt/sources.list?