使用Ubuntu Live CD修复Grub引导教程
<p style='margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";'>本文以 Ubuntu Live CD 修复 Grub 引导为例，已在 /dev/sda3 安装 Fedora。</p>
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<strong>首先制作 Ubuntu 启动 USB</strong></p>
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<span><u>复制代码</u></span>
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代码如下:</p>
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sudo dd if=ubuntu-13.10-desktop-amd64.iso of=/dev/sdb #/dev/sdb 为 USB 盘符</div>
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<strong>1.使用启动 USB 进入 Ubuntu 试用环境</strong></p>
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<strong>2.查看硬盘分区状况，获取 Linux 系统安装分区编号</strong></p>
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<span><u>复制代码</u></span>
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代码如下:</p>
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sudo fdisk -l</div>
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查看输出结果，然后根据文件类型和分区大小来判定 Linux 系统安装在哪块硬盘和安装的分区。我的电脑是在 /dev/sda3 安装了 Fedora。</p>
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或者，打开 Gparted 图形化工具来查看分区信息也可以。</p>
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挂载 Fedora 安装分区</p>
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<strong>3.已知 Fedora 安装在了 /dev/sda3 上，所以我们可以用下面命令来挂载 Fedora 安装分区。你需要将 /dev/sda3 换成自己的 Linux 安装分区。</strong></p>
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<span><u>复制代码</u></span>
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代码如下:</p>
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sudo mount /dev/sda3 /mnt</div>
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<strong>4.挂载其他所需的目录（使用 --bind）</strong></p>
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代码如下:</p>
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sudo mount --bind /dev /mnt/dev<br>
sudo mount --bind /proc /mnt/proc<br>
sudo mount --bind /sys /mnt/sys</div>
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<strong>5.Chroot 到硬盘上的 Linux 系统</strong></p>
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代码如下:</p>
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sudo chroot /mnt</div>
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<strong>6.安装&更新 Grub</strong></p>
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代码如下:</p>
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grub2-install /dev/sda<br>
grub2-mkconfig -o /boot/grub2/grub.cfg</div>
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<strong>7.Grub 已经修复成功，我们还需要退出 chroot 环境、卸载已经挂载的设备与目录：</strong></p>
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代码如下:</p>
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exit #退出 chroot 环境<br>
sudo umount /mnt/dev<br>
sudo umount /mnt/proc<br>
sudo umount /mnt/sys<br>
sudo umount /mnt</div>
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<strong>8.重启！</strong></p>
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