systemd のランレベル設定方法

$ runlevel
N 5
$ ll /etc/systemd/system/default.target
lrwxrwxrwx 1 root root 36 Apr 11 21:46 /etc/systemd/system/default.target -> /lib/systemd/system/graphical.target

$ sudo systemctl set-default multi-user.target
rm '/etc/systemd/system/default.target'
ln -s '/usr/lib/systemd/system/multi-user.target' '/etc/systemd/system/default.target'
$ sudo reboot

$ sudo systemctl set-default graphical.target 
rm '/etc/systemd/system/default.target'
ln -s '/usr/lib/systemd/system/graphical.target' '/etc/systemd/system/default.target'
$ sudo reboot