>The EFI system partition is conventionally /boot/efi on a Linux system;

Still often mounted as /boot/efi but physically residing on the root of the hidden ESP volume as EFI/boot & EFI/ubuntu, for distros like ubuntu.

So when mounted you have something like /boot/efi/boot/bootx64.efi and boot/efi/ubuntu/grub etc. if visible and accessible.