Already installed Ubuntu but now you want to install Windows without removing Linux? Here's what you should do to install Windows after Ubuntu in dual boot.

Ce guide vous permet d'installer Ubuntu 22.04 à coté de Windows 10 ou Windows 11. Grâce au dual boot vous sélectionner votre système.

https://www.tutos-informatique.com/meilleur-logiciel-sauvegarde-gratuit-windows/

If you want to use Windows 11 and Linux on the same computer, the best option may be to dual boot. Here's how to set up your PC for it.
https://www.minitool.com/partition-disk/windows-11-and-linux-dual-boot.html

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Looking for some harmony between Windows 10 and Linux in your dual-boot setup?  Here are a few ways you can make the tense OS situation a little more unified and copacetic.