Instructions:
- Remove everything but the SATA drive on the ODD port (this includes the SD, remove it too)
- Boot from USB to install ubuntu server or (whatever) to the SATA drive (It will detect no UEFI and install to MBR)
- Boot a live session from USB and run fdisk -l /dev/sda assuming that's your install HDD -- record the "Disk identifier," a hex number
- Insert the microSD into a USB reader (not the built in reader as that has to be active at boot)
- Check the device name with lsblkEdit syslinux.cfg to put your Device identifier in place of mine
- Run ./create-sd.sh /dev/sdb assuming sdb is the microSD
- Shutdown and transfer the SD card over to the internal reader.
- Remove the USB reader and connect everything