LinuxQuestions.org - Dovecot Server problem

Hi there, i have some problems to start my dovecot server on Debian 6.0.1 I tried to install it from webmin using "un-used modules" but it was allways the same error: "E: Unable to locate package dovecot-pop3d".
When I tried to install it from console using the commands: apt-get install dovecot-imapd dovecot-pop3d dovecot-common - and there are no problems with dovecot-imapd and dovecot-common, but still the same error with dovecot-pop3d: "E: Unable to locate package dovecot-pop3d".
After command: service dovecot status: could not access PID file for dovecot ... failed!
After try to start dovecot with comand "dovecot": Error: mail_executable: Can't use /usr/lib/dovecot/pop3: No such file or directory
Fatal: Invalid configuration in /etc/dovecot/dovecot.conf
It's interesting because on version 5.0 there were no problems to install and run dovecot server just pressing the button from webmin..

I've read a few similar threads in this forum about dovecot errors but still can't to fix it.
Any ideas?
Thanks!