Windows 10 startup item repair an operating system wasn’t found

Recently, in the dual systems deepin15(Ubuntu is also applicable) and Windows10, a series of problems encountered when uninstalling Deepin are recorded as follows: after installing Deepin system in
Windows, the general boot will change into Deepin boot, which will cause the boot item to disappear, and the system will not automatically restore win boot, resulting in the failure to enter the system normally. Before deleting deepin’s partition, I could use Deepin’s official unload instruction to instruct me to use. However, it was invalid, so I had to delete the partition by myself, and then started it with the U disk for repair.
(1-2 steps) needs to be made on another working computer

    download old peach or U boot or Chinese cabbage. And install. Insert the USB flash drive and make it with one click. When finished, unplug the usb flash drive. Insert the usb flash drive into the computer that cannot be started normally, press F12 to select the entry of the usb flash drive (the name is usually the manufacturer of your usb flash drive). Select windows8 to boot your new computer. Wait for normal entry. Open DiskGenius, change the disk to the one that was in good condition before (normally, starting from the USB drive will change the initial disk character), and use the boot repair software to fix it automatically. Exit reboot.

If the Win system can be started normally after 6 is completed, the latter can be ignored. Otherwise, if an operating system wasn’t found appears, press CTRL+ALT+DEL to restart something. Reboot or repeat above 3-5 (not 6). And follow the steps below to continue

    after entering the PE system, click the Windows logo in the lower left corner and find Dism++ in the folder. Open, the top bar to find the system where the partition, and click, find tools repair boot. Reboot, and that’s it.

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