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Ubuntu 20.04 is already in use, I want to install win 10, and keep Ubuntu. Kindly, guide me on how I can install 'win pro' without bootable Pendrive or with bootable pendrive.

mikewhatever
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It's not possible to install Windows without destroying Ubuntu bootloader. Every operating system has it's own bootloader and after you install OS Y after installing OS X, OS Y will destroy your current bootloader. Even with linux, when you install Fedora after installing Ubuntu, Fedora will overwrite Ubuntu bootloader. To solve the problem, simply make a new partition, install Windows on it, then boot your computer into Ubuntu from a bootable flashdrive and use Boot Repair to recreate Ubuntu bootloader. I've done it myself dozens of times.

jedi
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