I recall I used these http://cdimage.debian.org/cdimage/unofficial/non-free/cd-including-firmware/current/amd64/iso-cd/ Yes it is the first boot. Grub entries:
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Chose the default of one big partition. No errors. I even tried it both ways on this UEFI choice:
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And starting the installer both ways as shown in Bug#925579 . LS> Clearly the initramfs was able to mount /dev and run fsck, but mounting LS> it to /root/dev to transfer to the real rootfs failed due to a missing LS> directory. Anyway I am on my super low bandwidth mountain now for the next few months, (no network installs, no more casually downloading ISOs), so I'll have to make do with this one. Maybe related to https://wiki.debian.org/InstallingDebianOn/Asus/TUF-Z270-MARK-I
