1 1.首先删除已经存在的符号链接
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3 rm /etc/systemd/system/default.target
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5 2.默认级别转换为3(文本模式)
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7 ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target
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9 或者默认级别转换为5(图形模式)
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11 ln -sf /lib/systemd/system/graphical.target /etc/systemd/system/default.target
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13 3.重启 reboot
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15 reboot
重启即可看到自己默认init3 or init5（图形化界面、命令行界面）
