Add/Fix Synchronising package index files with debian repositories.

install_amavis.sh

@@ -731,6 +731,18 @@ tmp_err_msg=$(mktemp)
 echo
 echo -e "\033[37m\033[1mSome pre-installation tasks..\033[m"
 echo
+
+# - Synchronise package index files with the repository
+# -
+echononl "   Synchronise package index files with the repository.."
+apt-get update > "$tmp_err_msg" 2>&1
+if [[ $? -eq 0 ]] ; then
+   echo_ok
+else
+   echo_failed
+   error "$(cat $tmp_err_msg)"
+fi
+
 # - Install Prerequisites from debian package system
 # -
 echononl "   Install prerequisites from debian package system"