Windows:
1. Prepare the Windows corresponding mirror disk, the U-disk start the system (the following are the WINDOWS10 installation interface)
2. Go to Installation Interface < language, time, keyboard format; Click "Next"
3. In the "Install Now" screen, click on the "Repair computer" option at the bottom left
4. Click "Troubleshoot" to proceed to the next step
5. Select "Command Prompt" on the right to start the CMD interface
6. Input command: Bootsect/nt60 C:
7. When you see the success prompt, enter the command: BOOTREC/FIXMBR
8. Reboot to enter normal system
Ubuntu:
1. Prepare Ubuntu system disk, USB stick boot System
2. (Choose a good font), try the Ubuntu system
3. Connect to the network and open the terminal (Ctrl + Alt + T)
4. Input: sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update
5. Enter, information scrolling successful, re-enter: sudo apt-get install-y boot-repair && Boot-repair
6. After the software starts, click the "Repair" button (Recommended repair), follow the instructions given to proceed to the next step ...
7. Reboot to enter normal system
System Boot Repair----Windows and Ubuntu