Fix error on writing postfix 'master.conf' file. Synchronise Package indexes befor downloading debian packages.

install_amavis.sh

@@ -2342,7 +2342,7 @@ for _pkg in $_needed_packages_clamav ; do
    fi
 done
 if [[ -n "$needed_packages_clamav" ]]; then
-   DEBIAN_FRONTEND=noninteractive apt-get -y install $needed_packages_clamav > /dev/null 2> $tmp_err_msg
+   DEBIAN_FRONTEND=noninteractive apt-get -y install $needed_packages_clamav > $tmp_err_msg 2>&1
    if [[ $? -eq 0 ]] ; then
       echo_ok
    else
@@ -3601,6 +3601,7 @@ EOF
 
 
 	if $smtps_present && echo "$_line" | grep -i -E "^smtps\s+" > /dev/null 2>&1 ; then
+		_found=true
 		cat >> $postfix_master_cf << EOF
 smtps     inet  n       -       y       -       -       smtpd
   -o content_filter=amavisfeed:[127.0.0.1]:10024