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systemd[1]: /lib/systemd/system/plymouth-start.service:16: Unit configured to use KillMode=none. This is unsafe, as it disables systemd's process lifecycle management for the service. Please update your service to use a safer KillMode=, such as 'mixed' or 'control-group'. Support for KillMode=none is deprecated and will eventually be removed.
If I understant correctly, I have to copy the file /lib/systemd/system/plymouth-start.service to /etc/systemd/system and then change it. But I don't know how to copy it.