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First I installed Windows on just one partition (no others were created) following one partition windows installation, because I wanted to maximize the number of possible primary partitions.

When I installed ubuntu I got:

grub-efi-amd64-signed failed installation /target/ 

So grub failed to install.

On all installations I used lagacy support enabled on UEFI mode on a HP laptop.

How to solve it?

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On Ubuntu bootable USB I used boot repair, then Ubuntu appeared as an option.

I entered on ubuntu and used boot repair again, then grub identified Windows

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