[Dovecot] Error starting dovecot

[Diego Ledesma]

Hello,
I have a linux system (Ubuntu 7.04 server edition) running Postfix 2.3.8
Today i installed Dovecot through apt-get (got version 1.0.rc17
installed) and configured it to do sasl auth only, (i already have
other pop3,smtp and imap servers running) following the howto's at
dovecot.org
The thing is that if i try to start dovecot or run dovecot -n i get
this message:
Error: Can't use mail executable /usr/lib/dovecot/imap: No such file
or directory

That directory does not exist but why should it if i don't want to run
dovecot as imap?
I only installed dovecot-common package.
Also, i setted protocols to "none".

Does anyone know why i get that error message?

One last comment. Before installing dovecot on the production mail
server i installed it on my laptop's linux (Ubuntu 8.04 LTS) for
testing purposes.
The testing mail server runs Postfix 2.5.1 and Dovecot 1.0.10 and in
this case Dovecot runs fine (the /usr/lib/dovecot/imap directory does
also not exist and dovecot.conf is configured exactly on both
servers).

This are the uncommented parts of dovecot.conf

#Only use dovecot-auth
protocols = none
disable_plaintext_auth = no
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_location = maildir:~/Maildir
mail_privileged_group = mail

protocol imap {
}

protocol pop3 {
  pop3_uidl_format = %08Xu%08Xv
}

auth default {
  mechanisms = plain login

  passdb passwd-file {
    args = /etc/passwd.dovecot
  }

  passdb pam {
  }

  userdb passwd {
  }

  user = root

socket listen {
        client {
          path = /var/spool/postfix/private/auth
          mode = 0660
          user = postfix
          group = postfix
        }
      }
}

dict {
}

plugin {
}

----
Any help is greatly appreciated.
Thanks.
Diego.