Ubuntu下使用Ubuntu Live CD 修复Grub引导
<p style='margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";'>由于安装了windows系统，导致Grub出现问题，很多人会选择重装Ubuntu系统，其实完全没有必要，只要将Grub进行修复就可以了，下面小编就给大家带来使用Ubuntu Live CD 修复Grub引导的方法，一起来学习下吧。</p>
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<img style="max-width:100%!important;height:auto!important;"title="Ubuntu下使用Ubuntu Live CD 修复Grub引导" alt="Ubuntu下使用Ubuntu Live CD 修复Grub引导" ubuntu src="https://zhuji.jb51.net/uploads/img/202305/7a60de5cafcf5e1e6c2271837ba023b7.jpg"></p>
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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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首先制作 Ubuntu 启动 USB</p>
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复制代码代码如下：</p>
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sudo dd if=ubuntu-13.10-desktop-amd64.iso of=/dev/sdb #/dev/sdb 为 USB 盘符</p>
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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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代码如下：</p>
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sudo fdisk -l</p>
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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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代码如下：</p>
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sudo mount /dev/sda3 /mnt</p>
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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</p>
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sudo mount --bind /proc /mnt/proc</p>
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sudo mount --bind /sys /mnt/sys</p>
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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</p>
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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</p>
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grub2-mkconfig -o /boot/grub2/grub.cfg</p>
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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</p>
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sudo umount /mnt/dev</p>
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sudo umount /mnt/proc</p>
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sudo umount /mnt/sys</p>
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sudo umount /mnt</p>
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<strong> 8.重启！</strong></p>
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上面就是使用Ubuntu LiveCD修复grub的方法介绍了，如果你在使用双系统安装windows中出现Grub引导错误，不妨使用该方法进行修复吧。</p>
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