Changing Default and Active System-State Targets

Use the systemctl set-default command to change the default system-state target:

sudo systemctl set-default multi-user.target

Removed /etc/systemd/system/default.target. 
Created symlink /etc/systemd/system/default.target → /usr/lib/systemd/system/multi-user.target

Note:

This command changes the target to which the default target is linked, but doesn't change the state of the system.

To change the current active system target, use the systemctl isolate command, for example:

sudo systemctl isolate multi-user.target

For more information, see the systemctl(1) manual page.