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Introduction一般我会在计算机上装两个或者多个系统，例如，我在计算机上安装了Ubuntu、Windows 7、Windows 8.1。有一天我的Win8.1不能正常使用了，我想重新安装Win8.1，但是安装之后Linux就不能被引导进入了！大家知道Linux是使用Grub来引导的，那我们完全可以重新安装Grub！因为原先的Linux不能进入了，所以我们制作一个Linux系统安装盘，然后利用“试用Ubuntu“来完成这个任务。制作Linux安装盘暂时不说这个了。开始恢复列出磁盘分区ubuntu@ubunt:~$ sudo fdisk -l我有三个硬盘，输出结果如下：Disk /dev/sda: 1000.2 GB, 1000204886016 bytes255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 4096 bytesI/O size (minimum/optimal): 4096 bytes / 4096 bytesDisk identifier: 0x2bf44b31 Device Boot Start End Blocks Id System/dev/sda1 * 2048 209717247 104857600 7 HPFS/NTFS/exFAT/dev/sda2 209717248 419432447 104857600 7 HPFS/NTFS/exFAT/dev/sda3 419434494 1953523711 767044609 f W95 Ext'd (LBA)Partition 3 does not start on physical sector boundary./dev/sda5 419434496 629149695 104857600 7 HPFS/NTFS/exFAT/dev/sda6 629151744 838866943 104857600 7 HPFS/NTFS/exFAT/dev/sda7 838868992 1048584191 104857600 7 HPFS/NTFS/exFAT/dev/sda8 1048586240 1048975359 194560 83 Linux/dev/sda9 1048977408 1348974591 149998592 83 Linux/dev/sda10 1348976640 1548974079 99998720 83 Linux/dev/sda11 1548976128 1889515519 170269696 7 HPFS/NTFS/exFAT/dev/sda12 1889525760 1953523711 31998976 82 Linux swap / SolarisDisk /dev/sdb: 320.1 GB, 320072933376 bytes255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xc4e7c4e7Disk /dev/sdb doesn't contain a valid partition tableDisk /dev/sdc: 320.1 GB, 320072933376 bytes255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xafd68fba Device Boot Start End Blocks Id System/dev/sdc1 2048 209717247 104857600 7 HPFS/NTFS/exFAT/dev/sdc2 209717248 625139711 207711232 f W95 Ext'd (LBA)/dev/sdc5 209719296 625139711 207710208 7 HPFS/NTFS/exFAT其中System标记为Linux的就是Linux控制的分区了。挂载硬盘上的Linux分区我自己知道当初安装Linux的时候分区是这样的：/boot ～200MB/ ～150GB/home ～？所以我判断：/dev/sda8 /boot/dev/sda9 //dev/sda10 /home故作如下挂挂载操作：ubuntu@ubunt:~$ sudo mount /dev/sda9 /mntubuntu@ubunt:~$ sudo mount /dev/sda8 /mnt/bootubuntu@ubunt:~$ sudo mount /dev/sda10 /mnt/home挂载结束后，还要进行如下操作（原因不明）：ubuntu@ubunt:~$ sudo mount --bind /sys /mnt/sysubuntu@ubunt:~$ sudo mount --bind /proc /mnt/procubuntu@ubunt:~$ sudo mount --bind /dev /mnt/dev使用硬盘上的Linux系统重新安装grub如果你使用的是grub2：ubuntu@ubunt:~$ sudo chroot /mntubuntu@ubunt:/# grub2-install /dev/sdaubuntu@ubunt:/# grub2-mkconfig -o /boot/grub2/grub.cfgubuntu@ubunt:/# exit # 退出chroot如果不是grub2：ubuntu@ubunt:~$ sudo chroot /mntubuntu@ubunt:/# grub-install /dev/sdaubuntu@ubunt:/# grub-mkconfig -o /boot/grub/grub.cfgubuntu@ubunt:/# exit # 退出chroot退出 & 重起如果你想ubuntu@ubunt:~$ sudo umount /mnt/sysubuntu@ubunt:~$ sudo umount /mnt/procubuntu@ubunt:~$ sudo umount /mnt/devubuntu@ubunt:~$ sudo umount /mnt/homeubuntu@ubunt:~$ sudo umount /mnt/bootubuntu@ubunt:~$ sudo umount /mntubuntu@ubunt:~$ sudo shutdown -r -h now
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