systemd - 257-2 main

systemd is a system and service manager for Linux. It provides aggressive
parallelization capabilities, uses socket and D-Bus activation for starting
services, offers on-demand starting of daemons, keeps track of processes using
Linux control groups, maintains mount and automount points and implements an
elaborate transactional dependency-based service control logic.
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Installing the systemd package will not switch your init system unless you
boot with init=/lib/systemd/systemd or install systemd-sysv in addition.