Thanks Andrei. The firmware image (thanks Debian team!) did in fact have my wi-fi driver, saving a step. There is still one issue, and one point of feedback.
The issue is that despite not needing the second USB, the partitioner still complains that the free space is too small and I cannot use guided partitioning. This despite the fact I'm ready to wipe the target USB. I switched to the Busybox console (Ctrl+Alt+F2) and checked that the target USB was not mounted. Frustrating. My computer clearly can boot from both MBR (Windows partition is type 07h partition) and EFI partitions (the Debian ISO has partition type EFh). How I got the target media to boot was to answer "yes" when the installer asked whether I wanted to force EFI install. My target drive is still the USB, not my built-in hard drives which I wanted left alone. As long as I knew how to manually partition (ext4, swap, then EFI system partition), this created a bootable system. But guided partitioning for this scenario seems broken. Alan On 3/12/20, Andrei POPESCU <andreimpope...@gmail.com> wrote: > On Mi, 11 mar 20, 12:58:21, Alan Tu wrote: >> >> I have the second USB inserted into a different USB port. I need this >> second USB to have my *.ucode firmware file on it, for my Intel wifi >> chip. Therefore this second USB has a FAT32 partition at first. > > I would suggest you use an image that includes firmware, so the second > USB is not used by the installation process. > > https://cdimage.debian.org/images/unofficial/non-free/images-including-firmware/ > > Kind regards, > Andrei > -- > http://wiki.debian.org/FAQsFromDebianUser >