I had some trouble with the graphics drivers, and needed to start the system in runlevel 3. How to do that? Can’t just use the old inittab configuration file and set initdefault to 3 anymore.

I ended up changing the systemd default target. On the running system the /etc/systemd/system/default.target is a symlink to /usr/lib/systemd/system/graphical.target, but if I replace that with a symlink to /usr/lib/systemd/system/multi-user.target, that system will come up to runlevel 3. The easy way to do this is in systemctl

systemctl set-default multi-user-target
systemctl set-default graphical-target

I didn’t do it, but I also found a post recently that said you can simply put a runlevel on the end of the grub command line, i.e. add 3