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Ubuntu系统下修复Grub的步骤

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　　Ubuntu系统Grub如果发生了故障，很多人首先想到的就是重新安装Grub，这样反而浪费了很多时间。其实完全可以修复Grub来解决Grub上的故障，还能保留原来的设置，把影响降到最低。

　　Ubuntu系统如何修复Grub

　　1.想办法进入到Ubuntu的Live CD系统，或者其他较新版本的Live CD系统。

　　2.打开终端，输入sudo fdisk -l，查看ID=83的分区，记录下sd［NUM］，比如sda8。

　　3.如果上一步中存在多个ID=83的分区，自己想办法确定/分区所在的分区号，并且/boot也是和/分区挂载在同一个分区上，比如就是sda8。

　　4.输入sudo -i，获得root权限。

　　5.mkdir /media/tmp。

　　6.将/分区挂载到新建的目录mount /dev/sda8 /media/tmp。

　　7.如果以前的系统/boot是单独挂载的话，则需要找到/boot的分区如sda7，然后mount /dev/sda7 /media/tmp/boot。否则这一步直接跳过去。

　　8.接下来准备安装grub了，终端输入：grub-install --root-directory=/media/tmp /dev/sda。

　　9.如果看到Installation finished， no error occured之类的信息时表明已经成功了。

　　10.此时重启系统，应该可以看到原来的grub2引导界面回来了，并且如果有其他系统存在的话，也会显示启动项列表中

　　PS：如果step10中没有看到如你的Windows 8的启动项，则在正常启动Ubuntu后，终端输入sudo update-grub2，此后等待片刻应该可以看到Windows 8的启动项也会添加到列表中。

　　按照上面的步骤来修复Ubuntu系统下的Grub你会发现，比重新安装Grub还要方便快捷。当然想要修复Grub引导，还可以参考：Ubuntu下如何修复Grub引导。

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