Ubuntu 20.04 - Windows 10 dualboot from UBUNTU

[sliwkahax]

Hi! I wanted to make a windows - ubuntu dual-boot.
All the tutorial i have found were about making the dual-boot from windows.
Should i install windows like normal or what?
Thanks.

[Frogs Hair]

Welcome sliwkahax:

can you please provide some information about your system as well as what operating system if any is currently installed.

[sliwkahax]

I have ubuntu 20.04 right now, without any other systems. I have got a partition ready for windows.

[Frogs Hair]

It is recommended to install Ubuntu first to avoid windows overwriting Ubuntu. I have been dual booting with Win 7 and now 10 for years and have not tried installing windows after Ubuntu. There are some tutorials for installing that way but not having used those methods I can't recommend them. Backup before you start! At the very least you will have to update grub from a live Ubuntu media to get Ubuntu to boot after installing Windows. If you only need windows occasionally and have enough memory a virtual installation might be a better option to avoid problems with both installations.

There are tutorials if you search.
https://blog.webnersolutions.com/installing-windows-after-ubuntu-os-in-a-dual-boot-system/

[CelticWarrior]

If the system is UEFI the order of OS installations isn't relevant.

[Frogs Hair]

If the system is UEFI the order of OS installations isn't relevant.

One way to check is with the following command if you aren't sure.
ls /sys/firmware/efi