In the process of moving root directory to HDD and then the /var to its own partition I have to put my RPI3 into single user mode. I am googling around and checking this forum, but I did not find an answer how to do that. Any suggestion, link with help, …, something?
Hit shift when starting up. Hit “e” to edit config. tab over to cmdline.txt, add to the end of the line, init=/bin/sh hit ok, then Esc to boot… it will boot you as root, single user.