postfix not init on clean install

Debian clean Install postfix not init. is not added user nobody to the config

Nov 12 09:35:08 zod postfix[15589]: fatal: file /etc/postfix/main.cf: parameter default_privs: unknown user name value: nobody
Nov 12 09:35:29 zod postfix/cleanup[15642]: fatal: file /etc/postfix/main.cf: parameter default_privs: unknown user name value: nobody
Nov 12 09:35:30 zod postfix/master[15543]: warning: process /usr/lib/postfix/cleanup pid 15642 exit status 1
Nov 12 09:35:30 zod postfix/master[15543]: warning: /usr/lib/postfix/cleanup: bad command startup -- throttling

main.cf
root@vampirito:/etc/postfix# tail main.cf

fix with:
useradd nobody -r
#delay_warning_time = 4h
virtual_alias_maps = hash:/etc/postfix/virtual
mailbox_command = /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME
home_mailbox = Maildir/
inet_interfaces = all
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination
mydestination = $myhostname, localhost.$mydomain, localhost, zod.com.mx

root@vampirito:/etc/postfix# dpkg -s postfix
Package: postfix
Status: install ok installed
Priority: extra
Section: mail
Installed-Size: 2464
Maintainer: LaMont Jones
Architecture: i386
Source: postfix (2.3.8-2)
Version: 2.3.8-2+b1

Status: 
Closed (fixed)