Provided that you can dualboot now but want to change the order which OS boots first by default, there's no risk if you know how to use the terminal.

I just tried the trick and it worked.

You'll have to edit the line 'GRUB_DEFAULT=0' to read'GRUB_DEFAULT=2' (if I understand correctly you only have two operating systems. That will switch the default boot order between the two OS, the menu will stay put.

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