ubuntu 12.04 修复grub2方法-优快云博客

ubuntu 12.04 修复grub2方法

2012-04-28 02:18:38|  分类： ubuntu 软件安装 |字号订阅
可以采用LiveCD 启动Ubuntu，之后就在Ubuntu下操作。
打开终端：
# 切换到root权限
ubuntu@ubuntu-laptop:~$ sudo -i
#找你ubuntu10.04所在分区
root@ubuntu-laptop:~# fdisk -l
看到的信息（我的，:-)）：
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x191f4f73

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048    27265023    13631488   27  Hidden NTFS WinRE
/dev/sda2   *    27265024    27469823      102400    7  HPFS/NTFS/exFAT
/dev/sda3        27469824   237185023   104857600    7  HPFS/NTFS/exFAT
/dev/sda4       237187070   976771071   369792001    5  Extended
Partition 4 does not start on physical sector boundary.
/dev/sda5       237187072   446902271   104857600    7  HPFS/NTFS/exFAT
/dev/sda6       446904320   806904319   180000000    7  HPFS/NTFS/exFAT
/dev/sda7       910905344   976771071    32932864   83  Linux
/dev/sda8       810905600   910899199    49996800   83  Linux
/dev/sda9       806905856   808904703      999424   82  Linux swap / Solaris
/dev/sda10      808906752   810897407      995328   83  Linux

Partition table entries are not in disk order

Disk /dev/sdb: 8472 MB, 8472494080 bytes
255 heads, 63 sectors/track, 1030 cylinders, total 16547840 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a0d74

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb4   *         252    16547587     8273668    b  W95 FAT32

   2：把 /boot(linux启动的根目录)所在partition 先mount起來
   3：執行 sudo grub-install --root-directory=/media/0d104aff-ec8c-44c8-b811-92b993823444 /dev/sda
（0d104aff-ec8c-44c8-b811-92b993823444 就是有 /boot 那個硬碟的 UUID, /dev/sda ,只有一個硬碟的情況，一般都是sda,,可以進Gparted 看看。。）
在终端输入如下命令：

sudo update-grub

按照提示输入密码，如果顺利的话，会出现如下类似语句，那就表示成功了。

grub.cfg ...

Found Debian background: moreblue-orbit-grub.png

Found linux image: /boot/vmlinuz-2.6.31-15-generic

Found initrd image: /boot/initrd.img-2.6.31-15-generic

Found memtest86+ image: /boot/memtest86+.bin

Found Windows 7 (loader) on /dev/sda1

done