以前Fedora版本中修改运行级别方法为：
以root身份登入，编辑/etc/inittab文件
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vi /etc/inittab
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找到
id:5:initdefault: 这一行，将默认运行级别5(图形模式)改为3(文本模式)，即
id:3:initdefault:
然后重启
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reboot
reboot
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但Fedora15和16使用systemd创建符号链接指向默认运行级别。
使用以上方法查看/etc/inittab文件会发现如下内容：
# inittab is no longer used when using systemd.
#
# ADDING CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# Ctrl -Alt -Delete is handled by /etc /systemd /system /ctrl -alt -del.target
#
# systemd uses 'targets' instead of runlevels. By default, there are two main targets :
#
# multi -user.target : analogous to runlevel 3
# graphical.target : analogous to runlevel 5
#
# To set a default target, run :
#
# ln -s /lib /systemd /system / <target name >.target /etc /systemd /system / default.target
#
#
# ADDING CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# Ctrl -Alt -Delete is handled by /etc /systemd /system /ctrl -alt -del.target
#
# systemd uses 'targets' instead of runlevels. By default, there are two main targets :
#
# multi -user.target : analogous to runlevel 3
# graphical.target : analogous to runlevel 5
#
# To set a default target, run :
#
# ln -s /lib /systemd /system / <target name >.target /etc /systemd /system / default.target
#
修改方法为：
1.首先删除已经存在的符号链接
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rm /etc/systemd/system/default.target
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2.默认级别转换为3(文本模式)
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ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target
ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target
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或者默认级别转换为5(图形模式)
或者默认级别转换为5(图形模式)
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ln -sf /lib/systemd/system/graphical.target /etc/systemd/system/default.target
ln -sf /lib/systemd/system/graphical.target /etc/systemd/system/default.target
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3.重启
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reboot
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参考文章：