This is for the people who wants to change the UEFI and/or GRUB2 configuration. Why? To change boot order or to set default operating system to boot. I have a laptop which is installed an SSD and a SATA HDD. SSD for Windows 10 (without SSD, working with Windows is like going somewhere on a turtle) and sata HDD for Ubuntu 20.04. I don't know why, Windows take the charge of booting process. It boots without asking me. But I want my pc to ask me which OS should be booted, and if I do not give it an input, it should boot Windows. I can be able to choose Ubuntu whenever I want. Because of my wife, my system should be set up as default operating system is Windows. If you do not an input, computer should boot up into Windows. Because she has some difficulties with linux systems. How to Solve This? First it is needed to force the pc to boot into Ubuntu. And Ubuntu should ask which OS should be booted (because Windows never asks this or I do not know how to make it as...