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ubuntu grub2 修复（用liveCD）

2010-01-23 23:23:21| 分类： Ubuntu笔记 | 标签： |举报 |字号大中小订阅

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刚刚安装了Windows7 需要修复一下grub，以方便进入linux了

Recover Grub 2 via LiveCD

First, grab a copy of the latest Ubuntu LiveCD and boot it.
Open a terminal and type

$ sudo fdisk -l

Now, you need to remember which device listed is your linux distribution, for reference, /dev/sda1 will be used. Now we need to mount the filesystem to /mnt

$ sudo mount /dev/sda1 /mnt

If you have /boot on a separate partition, that need's to be mounted aswell. For reference, /dev/sda2 will be used.

$ sudo mount /dev/sda2 /mnt/boot Make sure you don't mix these up, pay attention to the output of FDISK

Now mount the rest of your devices

$ sudo mount --bind /dev /mnt/dev

Now chroot into your system

$ sudo chroot /mnt

You should be chroot'd into your system as root, you can now run commands as root, without the need for sudo.

Now you need to edit the /etc/default/grub file to fit your system

$ nano /etc/default/grub

When that is done you need to run update-grub to create the configuration file.

$ update-grub

To install GRUB 2 to the MBR, next you need to run grub-install /dev/sda

$ grub-install /dev/sda

If you encounter any errors, try grub-install --recheck /dev/sda

$ grub-install --recheck /dev/sda

Press Ctrl+D to exit out of the chroot.
Once you exit back to your regular console, undo all the mounting, first the /dev

$ sudo umount /mnt/dev

Now you can unmount the root system. (But if you have a separate boot partition which you mounted earlier, you have to unmount this first, or you will get a "device busy" error message.)

$ sudo umount /mnt

And you should be free to restart your system right into GRUB 2 and then into your system installation.

If you had alternate OS entries, update-grub might say "Cannot find list of partitions!". Ignore it and continue - once you can boot into your linux installation, do so and then rerun update-grub and grub-install /dev/sda as root.

for more：https://wiki.ubuntu.com/Grub2#Recover%20Grub%202%20via%20LiveCD

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ubuntu grub2 修复（用liveCD）

刚刚安装了Windows7 需要修复一下grub，以方便进入linux了

Recover Grub 2 via LiveCD

历史上的今天

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