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May 20, 2021 at 6:22 comment added Iorippi @DavidAnderson I just confirmed that, and I'm pretty lost at grasping what each installer does to EFI partition looking at the back up (like, how Ubuntu did not boot up if it had created bootx64.efi. I guess it was missing the driver for ext4 that rEFIned added later?) It's not in hurry so I think I'll use virtual machine while I slowly figure out each installation steps rather than relying on handy Ubuntu installer :P
May 20, 2021 at 5:54 vote accept Iorippi
May 15, 2021 at 9:05 comment added David Anderson Some parts of the answer you have linked to are no longer true. For example, the current Ubuntu does create the \EFI\Boot\bootx64.efi file. This is the same as the \EFI\ubuntu\shimx64.efi file. The problem with older answers is an answer may not apply to the model Mac your are using and/or the versions of the software may have been updated.
May 15, 2021 at 7:31 comment added Iorippi @DavidAnderson Thanks for another tips! You're really helping me into the directions. I've just done a bit of research on booting process and now I understand the 2nd option! (apple.stackexchange.com/a/235505/74187) Perhaps I'll go that route, but I'll study the first option before proceeding. Is it "EFISTUB booting"?
May 15, 2021 at 6:55 comment added David Anderson Ubuntu and Windows both store their version of bootx64.efi in the \EFI\Boot folder in the EFI partition. For Windows, \EFI\Boot\bootx64.efi is the same file as \EFI\Microsoft\Boot\bootmgfw.efi. Some possible solutions: 1) Install a GRUBless Ubuntu. 2) Move GRUB to a another EFI partition. 3) Add a manual entry of Windows in the refind.conf file.
May 15, 2021 at 1:56 comment added Iorippi @DavidAnderson Haha yes I surely do! Seems like this (apple.stackexchange.com/a/253351/74187) would do for me, so I'll keep the copy of EFI partition as I proceed and learn what how they works step by step for starter.
May 14, 2021 at 17:54 comment added David Anderson Now you might want to ask how to do a triple boot.
May 14, 2021 at 15:47 history edited Iorippi CC BY-SA 4.0
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May 14, 2021 at 15:20 history answered Iorippi CC BY-SA 4.0