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Here is how i do it:

Fisrt you have install other init system other then systemd to repl

Here is how to install openrc:

sudo apt install openrc-init

Here is how to install runit:

sudo apt install runit-init

Next disable systemd package in apt for prevent apt install systemd

Put it in /etc/apt/preferences.d/systemd.pref to prevent apt instal

Package: systemd

Pin: release a=*

Pin-Priority: -10