commands:
1)grep -E "^(menuentry|submenu)" /boot/grub/grub.cfg | cut -d"'" -f2 | nl -v0
> you should see the menu entries now
2) edit "/etc/default/grub" and change entry "GRUB_DEFAULT"
3) run command "update-grub" to update the boot-loader

https://askubuntu.com/questions/1341389/need-to-change-default-boot-order-instead-of-ubuntu-21-04-to-windows-7

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