I am the first to install Ubuntu20, install Win10 again, use the following method, measure success,

By default, the default boot Ubuntu system, set the default boot into win10 way is:

(1) into the ubuntu system;

(2) open a terminal and into the/etc/default directory;

(3) using sudo gedit grub open grub configuration file, amend the GRUB_DEFAULT=0 to you want the default boot the system serial number, after being set;

Note: the system serial number to start to see the order, starting from 0, the default ubuntu for the first, namely the number 0, my win10 system in the third, so set GRUB_DEFAULT=2

(4) enter sudo update - grub update grub file;

5. Restart the system, completed,
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