>>>使用子菜单

选择默认子菜单，GRUB_DEFAULT="2>0"

From:

 

>>>不使用子菜单

# sudo vim /etc/default/grub

添加配置：GRUB_DISABLE_SUBMENU=y

From:

>>>引导某个分区

/etc/grub.d/文件夹下编辑 40_custom 文件。 也可以#mv 40_custom 01_custom把文件里的菜单放前一点。

#!/bin/sh

exec tail -n +3 $0

# This file provides an easy way to add custom menu entries.  Simply type the

# menu entries you want to add after this comment.  Be careful not to change

# the 'exec tail' line above.

menuentry 'Boot msdos2' {

        set root='hd0,msdos2'

        chainloader +1

}

menuentry 'Boot msdos3' {

        set root='hd0,msdos3'

        chainloader +1

}

menuentry 'Boot msdos7' {

        set root='hd0,msdos7'

        chainloader +1

}