Devuan GNU+Linux is a free software operating system for your
computer. Free software means you are free to use, copy
and distribute, study, change the software, and share your
modifications with the community.
software freedom, your way
apt install init
metapackages : required : essential
System-V-like init utilities - metapackage
This package is an essential metapackage which allows you to select from
available init systems in Devuan (sysvinit, upstart) while
ensuring that one of these is available on the system at all times.