Ubuntu Windows dual system disk scrambling grub causes error:no such partition grub rescue>

Messing with partition disks or something that causes the boot to be the same as this man: Http://zhidao.baidu.com/question/495602654256708364.html?ssid=0&from=1001874a&uid =0&pu=usm%401%2csz%401320_1002&bd_page_type=1&baiduid=7072d7cc851f02903dd10eabc3e63223&tj=www_ Zhidao_normal_5_0_10_title

And then every time to can through set prefix what to go in, but always can not each boot up like this to force, then find someone to help the following:

First: sudo update-grub

then; sudo grub-install/dev/sda

Maybe that's the way it is, plus

DF can look at the disk situation, there may be/dev/sda6 ah such a situation

The/boot/grub/grub cfg file can see the power-on item, or the file can be