Installing a full-featured Postfix / Dovecot email server in Linux with antivirus & antispam protection + webmail access from tecmint guide

Hello,
Today I was start install Postfix server with guide from tecmint but I was stack on start when I want to start:
systemctl enable apache2 mariadb I get this error Synchronizing state for apache2.service with sysvinit using update-rc.d... Executing /usr/sbin/update-rc.d apache2 defaults Executing /usr/sbin/update-rc.d apache2 enable Failed to execute operation: No such file or directory
I installing on Debian 8 jessie
Thank you for any help.