Reflash your ssd with a fresh image. Confirm the hash of your image matches the hash provided in the repo
Discussion
I confirmed the hash the first time around but I'll try a reflash in the morning
I found that there was a hidden partition on the drive I was installing to and once I’d reformatted again, the install worked. That said, I’d tried two old laptops by then in vain and eventually built my own out of old PC parts and a subwoofer case.