I encountered an error during the install of a deb which led me to the discovery that my current init system is still sysvinit.
The error was: /sbin/init: invalid option -- '-' Usage: init {-e VAR[=VAL] | [-t SECONDS] {0|1|2|3|4|5|6|S|s|Q|q|A|a|B|b|C|c|U|u}} Thanks to the wiki: https://wiki.debian.org/Init I determined that in all likelihood I am still using sysvinit, which circumstance was responsible for that error. Problem: The wiki article suggests how to switch from systemd to sysvinit, but is not forthcoming as to the converse change, hence my Subject: line. How should I approach this change with an eye to maximum safety? Thank you -- Man is essentially a dreamer, wakened sometimes for a moment by some peculiarly obtrusive element in the outer world, but lapsing again quickly into the happy somnolence of imagination. Russell