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Apparently there is a problem with your EFI partition. Maybe there is something similar to this other thread: help-regarding-low-efi-space
With the new default bootloader (grub-bls) you need 2-4 GB for the EFI partition and depending on the installer you are using the default might be much lower than that.
Or you may change the bootloader to grub2-efi in the bootloader section before the beginning of the actual install.
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