I've been handed an Intel Joule 570x and would like to get started.

Following the directions on this page
( <https://developer.ubuntu.com/core/get-started/intel-joule> ), I can install Ubuntu 16.04 LTS 64-bit into either MMIC or SDHC memory.

But I've had a few unhappy experiences using SDHC on embedded platforms.

I have a 320 GB SATA drive attached to the Joule with a SATA-to-USB adapter. The Ubuntu installer "sees" the HD... it also sees the rest of the Joule and up pops a menu wanting to know what I want to do.

I want to put Ubuntu onto the external HD. So I select "Something Else".

Then starts an endless cycle of "no root device selected" and wants me to correct that in the partition portion of the installer.

Unfortunately, that pop-up won't go away.

So I cancel the install and Ubuntu comes up running from the USB thumb drive (the one created per that web page). The drive can be partitioned... but it's still stuck at that "no root device selected" pop-up.

I'm missing at least one step. If the installer "sees" that the MMIC or SDHC memory needs partitioning and formatting, then what is the "magic sugar" to allow it to recognize that external HD?

Your time is appreciated.