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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

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  • Try labeling the first EFI partition just like the created one, and delete the created one, maybe copy any contents to the frst too. This is really a Windows question, nothing to do with Ubuntu. – ubfan1 Mar 31 at 1:02
  • Did you do a fast format of NTFS? If you did, maybe try a full format (writing to every bit). – AlienDrew Mar 31 at 2:13
  • This is a windows problem not Ubuntu ;-) – Rinzwind Apr 1 at 8:04
  • @ubfan1 - that depends on the point of view; for me Ubuntu is the main actor here, Windows is just expendable annoyance – adrhc Apr 1 at 9:31
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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 spate at the end of the disk was restored
  3. I restarted the Windows 10 installation -> successful this time

This works for me because my motherboard (Asus H370-I) still allows me to choose as booting partition any of these:

  • the previous Ubuntu-EFI one (now just fat32)
  • the new Windows-EFI one

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