双硬盘双Win8加Ubuntu修复Grub

双硬盘双win8加Ubuntu是条件，grub已经不能够启动了，要修复一下，使其能够启动这个3个系统。具体的分布是：硬盘A+Win8A 硬盘B+Win8B+ubuntu。现在默认启动的是Win8。使用LinuxLive USB Creator制作usb live，然后从u盘启动。Linux安装助手LiLi USB Creator 2.8.25发布 http://www.linuxidc.com/Linux/2013-10/92052.htm按照如下操作：--------------------------------------------------------------------------How to Repair, Restore, or Reinstall Grub 2 with a Ubuntu Live CD or USBGrub 2 typically gets overridden when you install Windows or another Operating System. To make Ubuntu control the boot process, you need Reinstall （Repair/Restore） Grub using a Ubuntu Live CD.Warning:Using the sudo command, especially from a Live CD can do serious damage to your system. Read all instructions and confirm you understand before executing any commands. When pasting into the Terminal, use Ctrl+Shift+V, NOT Ctrl+V.Terminal Commands:Mount the partition your Ubuntu Installation is on. If you are not sure which it is, launch GParted （included in the Live CD） and find out. It is usually a EXT4 Partition. Replace the XY with the drive letter, and partition number, for example: sudo mount /dev/sda5 /mnt.sudo mount /dev/sdXY /mntNow bind the directories that grub needs access to to detect other operating systems, like so:sudo mount --bind /dev /mnt/dev && sudo mount --bind /dev/pts /mnt/dev/pts && sudo mount --bind /proc /mnt/proc && sudo mount --bind /sys /mnt/sysNow we jump into that using chroot.Now install, check, and update grub.This time you only need to add the drive letter （usually a） to replace X, for example: grub-install /dev/sda, grub-install –recheck /dev/sda.grub-install /dev/sdXgrub-install --recheck /dev/sdXNow grub is back, all that is left is to exit the chrooted system and unmount everything.exit && sudo umount /mnt/dev && sudo umount /mnt/dev/pts && sudo umount /mnt/proc && sudo umount /mnt/sys && sudo umount /mntShut down and turn your computer back on, and you will be met with the default Grub2 screen.You may want to update grub or re-install burg however you like it.Congratulations, you have just Repaired/Restored/Reinstalled Grub 2 with a Ubuntu Live CD！--------------------------------------------------------------------------这里说下注意事项：1.制作的usb live用的ubuntu版本要和硬盘上已经装的位数（同为32或者64）一致且最好是同一版本.否则有些命令不能使用。2.对于第4步的grub-install /dev/sdX，后边的“X”要是现在默认启动的硬盘，如这边的情况，应该对应的是硬盘A。3.如何查看硬盘上不能启动的ubuntu的版本号，可以去/etc/os-release中查看，也可以grep "VERSION" /etc -rn4.如遇到“chroot:failed to run command "/bin/bash" :Exec Format error”，说明犯了1错误5.关于让默认启动Win8的问题，修改/etc/grub.d/30_os-prober不再好使，因为它会prober出两个win8最终还是不知道要启动哪一个。如果要修改可以修改/boot/grub/grub.cfg。Ubuntu 13.10 下载、安装、配置整理汇总 页面 http://www.linuxidc.com/Linux/2013-10/91564.htmWindows 7下硬盘安装Ubuntu 13.10图文教程见 http://www.linuxidc.com/Linux/2013-10/91565.htmGit实用命令速记解决Window文件到Ubuntu中乱码问题相关资讯 Grub Ubuntu Grub修复

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