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Thanks for your clear answer. I've read that gpt can transparently convert the disk to GPT and even create the EFI partition. Is that correct?
– alvaroc
Commented Sep 8, 2023 at 18:59
Converting the disk is easy, creating the EFI partition in a dual-boot system might need manual work (Windows' mbr2gpt.exe won't know what to do with Ubuntu). After conversion, partition and format it manually, then install both bootloaders using bcdboot.exe and grub-install. Keep in mind that after GPT conversion you're not limited to 4 partitions anymore, and that it's usually possible to shrink partitions, so you can later create a new Linux swap partition elsewhere if you want.
– grawity_u1686
Commented Sep 8, 2023 at 19:14

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