dovecot not starting properly

Hi all,

I just tried following the linode library article on running a mail server using postfix and dovecot. I am running ubuntu 11.10. However, there's a few problems. After putting in the dovecot configuration by copying and pasting the lines from the article (only changing the password), dovecot gets killed every time it tries to start (or so it seems). Every time I tried service dovecot restart, it says:

restart: Unknown instance:

In the log I saw only one time that it said something about terminated with signal 15.

Hope someone can help.

Thanks,

-Michael.