sudo systemctl set-default multi-user.target
NOTE: This command creates a symbolic link from /etc/systemd/system/default.target to /lib/systemd/system/multi-user.target.
ls -lh /etc/systemd/system/default.target
returns:
lrwxrwxrwx 1 root root 42 Jan 4 16:31 /etc/systemd/system/default.target -> /lib/systemd/system/multi-user.target