Bastille and Ubuntu debootstrap, run with systemd

Hi, I just trying to run Ubuntu jail via Bastille but need to do it with systemd to use with snap.
Bash:
root@ubuntu:/# systemctl
System has not been booted with systemd as init system (PID 1). Can't operate.

Read step by step by this tutorial, except last package install.
Bash:
root@ubuntu:/# apt-get install -y sysvinit-core
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package sysvinit-core is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  systemd-sysv

E: Package 'sysvinit-core' has no installation candidate

May I ask for help with it?
 
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