你是對的！！

# Enabling systemd
（轉貼）When the GRUB screen is displayed at the very beginning of the boot process, click on Advanced options… and select to use systemd. Use MX Boot Options to make this the default.
（編按：除了在MX Boot Options選use systemd.，記得勾選Use Flat Menu，再存檔離開，最後重開機）

You can remove the sysVinit option entirely by installing systemd-sysv. That will replace /sbin/init with a symlink to systemd. Remove the package to revert to the stock behavior. The only disadvantage to a systemd-only setup is that the MX live system doesn’t work 100% with it (snapshot and the live usb persistence features).
出處： https://mxlinux.org/wiki/system/systemd/

# Install and Use FirewallD on MX Linux/ Debian 11
（轉貼）If you already have UFW installed, disable it.
sudo ufw disable

Next, update system packages:
sudo apt update

Now install firewalld from the apt repository
sudo apt -y install firewalld
sudo apt -y install firewall-config

Confirm if firewalld has been installed by checking the version
sudo firewall-cmd --version

Enable firewalld service
If you want firewalld to run at system boot, enable this using the command:
sudo systemctl enable firewalld

出處： https://itnixpro.com/install-and-us...d-on-debian-11/

How to Get Started With firewalld on Linux
https://www.howtogeek.com/807545/ho...walld-on-linux/

linux系統中firewalld防火牆管理工具firewall-config（GUI圖形用戶界面）
https://www.cnblogs.com/liujiaxin2018/p/13906921.html

nftables 是 Debian 中使用的默認框架（自 Debian 10 Buster 起）
https://wiki.debian.org/nftables