Ubuntu fixed grub and USB flash drive boot Problems

Ubuntu fixed grub, USB flash drive boot problem computer is win7 and ububtu dual system. Yesterday we adjusted the partition and re-installed ubuntu with a USB flash drive. The installation process went smoothly, when the USB flash drive is unplugged, the system prompts that the partition cannot be found, and grub mode is used. The grub resucue is displayed on the screen. Google, just press the command. Grub resuce> ls (hd0) (hd0, msdos9) (hd0, msdos8) ...... # list the hard disk score area information # which is our ubntu partition? Run the following command to display linux Files one by one. My grub resuce> ls (hd0, msdos8)/grub resuce> root = (hd0, msdos8) grub resuce> prefix =/boot/grub resuce> set root = (hd0, msdos8) grub resuce> set prefix = (hd0, msdos8) /boot/grub resuce> insmod normal grub resuce> normal commands are amazing, in this way, after entering ubuntu and updating grub, sudo update-grub can also pre-boot to ubuntu with a USB flash drive and use the "disk usage tool" to view the partition information of ubuntu, my ubuntu is installed in/dev/sda8