this post was submitted on 15 May 2024
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chapotraphouse
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If you separately install each OS to a separate drive (no dual booting) then it works fine, there's no mixing of boot entries or partitions. Just use manual boot override on your motherboard to select the other if you want to switch to the other OS.
Memory is hazy since this was three years ago but I remember windows not handling/liking multiple EFI partitions. Perhaps that has changed, or the disk order matters or something.
Like there's this article: https://learn.microsoft.com/en-us/troubleshoot/windows-client/windows-security/cannot-boot-windows-on-primary-hard-disk-uefi
I dual boot Ubuntu with Windows 10 on a second drive since 2-3 years, but I don't understand why it works then. I only have one EFI partition (whatever that is) though, on my Linux drive, and I can boot from either drive just fine.