装了Win8 DP后，把原来的启动项全部弄乱了，将Win7和Win8设置成从Win7启动后，修复了BootThink重启的问题，Mac能启动了，最后就是解决Ubuntu的启动问题。
用LiveCD试用Ubuntu，打开终端：
- sudo -i
- fdisk -l 查看Ubuntu系统所在的分区，为/dev/sdaX，X的具体值因人而异，可能根据system为Linux确定X的值。
- mount /dev/sdaX /mnt X根据上一步换成对应的值（单独Boot分区的还要mount /dev/sdaY /home/ubuntu/mnt/boot）
-
grub-install --root-directory=/mnt/ /dev/sda（注意，如果这步出错，请往下看）
- 没了，重启吧
重启之后就可以看到Ubuntu那熟悉的紫色界面了。
如果在启动界面重没有其他系统的启动项，需要在进入Ubuntu后在终端中加一句：
sudo update-grub2
over。
注意：上面黑色部分的root前面是两个“-”（短横线）不是一个“–”（长横线），这是半角全角问题，请手动编辑下。
否则会出现以下提示：
a-nerd:~$ grub-install --root-directory=/mnt/ /dev/sda
Unrecognized option `-root-directory=/mnt/'
Usage: grub-install [OPTION] install_device
Install GRUB on your drive.-h, --help print this message and exit
-v, --version print the version information and exit
--modules=MODULES pre-load specified modules MODULES
--boot-directory=DIR install GRUB images under the directory DIR/grub
instead of the /boot/grub directory
--grub-setup=FILE use FILE as grub-setup
--grub-mkimage=FILE use FILE as grub-mkimage
--grub-mkrelpath=FILE use FILE as grub-mkrelpath
--grub-mkdevicemap=FILE use FILE as grub-mkdevicemap
--grub-probe=FILE use FILE as grub-probe
--no-floppy do not probe any floppy drive
--allow-floppy Make the drive also bootable as floppy
(default for fdX devices). May break on some BIOSes.
--recheck probe a device map even if it already exists
--force install even if problems are detected
--disk-module=MODULE disk module to use
Usage: grub-install [OPTION] install_device
Install GRUB on your drive.-h, --help print this message and exit
-v, --version print the version information and exit
--modules=MODULES pre-load specified modules MODULES
--boot-directory=DIR install GRUB images under the directory DIR/grub
instead of the /boot/grub directory
--grub-setup=FILE use FILE as grub-setup
--grub-mkimage=FILE use FILE as grub-mkimage
--grub-mkrelpath=FILE use FILE as grub-mkrelpath
--grub-mkdevicemap=FILE use FILE as grub-mkdevicemap
--grub-probe=FILE use FILE as grub-probe
--no-floppy do not probe any floppy drive
--allow-floppy Make the drive also bootable as floppy
(default for fdX devices). May break on some BIOSes.
--recheck probe a device map even if it already exists
--force install even if problems are detected
--disk-module=MODULE disk module to use
INSTALL_DEVICE can be a GRUB device name or a system device filename.
grub-install copies GRUB images into /boot/grub, and uses grub-setup
to install grub into the boot sector.
Report bugs to <bug-grub@gnu.org>.
本文链接地址: 用LiveCD修复Ubuntu的启动项
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