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I recently built a computer and put LinuxMint 17.3 on it right away. I now have a free copy of Windows 10. I haven't really been able to find detailed instructions on how to install Windows while keeping Linux. I know I have to re-size partitions but I have never really used these tools before and would rather not just mess around with them until I figure it out.

anthony
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    The original answerer is right, but if you want a more detailed (but still applicable to all Linux distros) answer with each step explained, see: https://askubuntu.com/questions/6317/how-can-i-install-windows-after-ive-installed-ubuntu There's also a great Ubuntu-specific answer in there which is different and may be better for some people. – npfoss Aug 18 '18 at 00:52

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First if you aren't sure of what you are doing, make a backup of your important data. Then you have to follow 3 steps :

  1. Open GParted and resize your linux partition(s) in order to have at least 20Gb of free space.
  2. Boot on the Windows installation DVD/USB and select "Unallocated space" to not override your linux partition(s).
  3. Finally you have to boot on a Linux live DVD/USB to re-install Grub (the boot loader) as explained here.

I assure you that if you pay attention there will be no problem for your linux. Good luck !

P.S. : If you want me to give more informations about step 3, I can explain you the steps (mount/dev/xxx /mnt, chroot /mnt, update-grub, grub-install, umount, ...).

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Théo
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