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修改Grub2启动菜单等待时间的正确方法

修改

/etc/default/grub   update-grub

/boot/grub/grub.cfg

 文件

找到下图标出的位置，将set timeout=5中的5改为你想要修改的等待时间
修改Grub2启动菜单等待时间的正确方法
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