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Adrian
Asked: 2019-03-31 16:10:17 +0800 CST

UEFI: Install Ubuntu first then Windows 10

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What should I do in order to install Windows 10 after I already installed Ubuntu (>= 18.10)? both should work in UEFI mode

GParted shows this after failed Windows installation attempt (/dev/nvme0n1p 4-7 were created at install moment):

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At installation moment I get:

Windows detected that the EFI system partition was formatted as NTFS. Format the EFI system partition as FAT32, and restart the installation

enter image description here

dual-boot xubuntu uefi windows-10

2 Answers

  1. Well, I solved this way:

    1. removed efi & boot flags from the already existing Ubuntu-EFI partition (/dev/nvme0n1p5 for me) and let just fat32 flag
    2. I removed Windows related partitions (created at installation moment) so that the initially empty space at the end of the disk was restored
    3. I restarted the Windows 10 installation -> successful this time

    This works because my motherboard (Asus H370-I) allows me to choose the booting partition:

    • the previous Ubuntu-EFI one (now just fat32) -> my curent choice
    • or the new Windows-EFI one

    Then by default I boot Ubuntu but I can switch to Windows from the grub menu.

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  2. I hit this same challenge trying to install Windows on my Ubuntu machine.

    I used my Mac to format and create the bootable USB Stick, and the issue was how I formated the stick.

    At first I had the "GUID Partition Map" scheme set, and I got the above error. But when I changed to "Master Boot Record" the installer worked just fine.

    Hope this helps someone else in the same pickle as I was in!

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