Comment 16 for bug 1872077

@Derk You can't really have multiple Ubuntu installations working correctly bootloader wise, as they

(1) all install to EFI/ubuntu on the ESP(s)
(2) remove any other installations from the boot options and boot menu

So you're basically flip flopping the installation in /boot/efi between different Ubuntu installations (and, possibly other distros, in the removable path EFI/boot/bootx64.efi).

In any case, I don't believe your input is useful here. The debconf values for your new install are distracting - they don't tell us what went wrong, just that you chose not to install anything.