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  • Great, this is the thing I am looking for. Thanks for your help!
    – Becker
    Commented Sep 4, 2023 at 15:51
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    This answer contradicts other answers and articles I've seen, like this one and this one. The latter was written by the author of gdisk. In particular I doubt that the following statement is true: "If it has used your second EFI partition, the Kubuntu installation would have been ignored by the BIOS that will only look at the first one". For now the answer looks like a try to explain the observed behavior using superficial knowledge and common sense in a hope it will look plausible enough to be upvoted and accepted. Commented Sep 4, 2023 at 16:07
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    @TomYan: Of course the first EFI can point anywhere at all, but the pointing boot entry still needs to be written into it. There is no reason for the installer to point to another EFI partition rather than to the operating systems loaders, or even to search for it. One may use the installer to create 10 EFI partitions, but that doesn't mean that it needs to actually use all of them.
    – harrymc
    Commented Sep 4, 2023 at 18:31
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    I also suggest to the downvoters to read Wikipedia EFI system partition and Arch Linux EFI system partition which clearly states not to create a second EFI partition.
    – harrymc
    Commented Sep 4, 2023 at 19:15
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    Sorry, I don't just read the ArchWiki. I have been with Arch for years on different UEFI implementations. I also suggest you get more hands-on experiences and/or read specs, before believing in / spreading / misinterpreting FUDs, which have always been common on wikis by nature. (But really, the biggest problem here is that you don't reason with logic. It's not even about whether you should or should not have multiple ESPs.)
    – Tom Yan
    Commented Sep 5, 2023 at 0:55