Install fails at desktop main py

[SomeDudeInAZ]

I believe this is what you need:

Installation from USB fails with bootloader script exception

Guessing here, but if you take a look at this StackExchange answer, we see that EFI\boot\bootx64.efi is the fallback bootloader path, and it looks like since it already exists, instead of either failing successfully or prompting to overwrite / rename / etc, it causes a failure state of the bootloader installation script? However, if you take a look at that page, the fallback is completely optional, and mostly used for booting OSes on removable devices, looks like Windows (of course) just instal…

Specifically (from @rogers):

I’ve since found that changing installEFIFallback to false in /etc/calamares/modules/bootloader.conf works