If you install Ubuntu as a traditional dual-boot with Windows, Ubuntu will make itself the default operating system to boot up (you get a few seconds to switch to Windows with the arrow keys). If you would like to change the boot order, you can do so by editing the Grub boot menu.
Edit the grub file
Nano /etc/default/grub
Set the Grub_Default=4 from 0
Command update-grub
Reboot . Should boot into windows
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