我有一个装有 Ubuntu 12.04 的盒子，刚刚进行了 apt-get 升级。系统弹出一个对话框要求我更新 GRUB 引导加载程序，但出现了以下消息：
The GRUB boot loader was previously installed to a disk that is no longer present,
or whose unique identifier has changed for some reason. It is important to make sure that the
installed GRUB core image stays in sync with GRUB modules and grub.cfg. Please check
again to make sure that GRUB is written to the appropriate boot devices.
If you're unsure which drive is designated as boot drive by your BIOS, it is often
a good idea to install GRUB to all of them.
Note: it is possible to install GRUB to partition boot records as well, and some
appropriate partitions are offered here. However, this forces GRUB to use the blocklist
mechanism, which makes it less reliable, and therefore is not recommended.
GRUB install devices:
[ ] /dev/sda (3000592 MB; ST3000DM001-9YN166)
[ ] /dev/sdb (3000592 MB; ST3000DM001-9YN166)
[ ] /dev/md1 (536 MB; rescue:1)
[ ] /dev/md2 (1099510 MB; rescue:2)
我担心选择错误的选项会导致我的盒子无法启动。我无法物理访问它，因为它是云中的一个盒子。请提供建议！
编辑：
这是我的 /etc/fstab：
proc /proc proc defaults 0 0
/dev/md/0 none swap sw 0 0
/dev/md/1 /boot ext3 defaults 0 0
/dev/md/2 / ext4 defaults 0 0
/dev/md/3 /home ext4 defaults 0 0
这是我的 df -h：
Filesystem Size Used Avail Use% Mounted on
/dev/md2 1016G 127G 838G 14% /
udev 16G 4.0K 16G 1% /dev
tmpfs 6.3G 768K 6.3G 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 16G 0 16G 0% /run/shm
/dev/md1 496M 44M 427M 10% /boot
/dev/md3 1.7T 368G 1.3T 23% /home
答案1
从 OP 的评论中，我们得知，他通过在 和 上安装 GRUB 解决了该问题/dev/sda。/dev/sdb评论内容如下
仅供参考，我已经让它工作了，并在
/dev/sda和上都安装了 GRUB/dev/sdb。