Ubuntu 16.06 LTS默认启动界面设置

• 字符界面亦即tty1 ~ tty6

$ sudo ln -sf /usr/lib/systemd/system/multi-user.target /etc/systemd/system/default.target
或
$ sudo systemctl set-default multi-user.target

• 图形界面亦即tty7

$ sudo ln -sf /usr/lib/systemd/system/graphical.target /etc/systemd/system/default.target
或
$ sudo systemctl set-default graphical.target