Is it safe to say that if there isn’t an official image on Armbian that I should stay away from a specific board? I’m really looking at the Rock64 right now, but based on these discussions it seems like you’re still working on getting Armbian running on it.
I recommend that you ask this in the Armbian forums. They are very nice and informative. In my short experience, the armbian image for the rock64 wasn’t ready yet. @inos pointed me to the ayufan image and that one seems to work. He has NCP running on it. You would have to build it yourself, or maybe someone is sharing it.
Hopefully it will be available from armbian soon and I’ll create an SD card for it.
Is Armbian necessary to get Nextcloud running? Could I theoretically just install Debian, or Dietpi, or something else and install Nextcloud on that, and just do all this manually?
You can install on any system that uses docker with the docker image, or you can install in any system of any architecture as long as it runs Debian 9 with the “curl installer” link
What are the specific hurdles that we’re up against with untested boards right now? Is it just kernal incompatibilities, drivers?
Again, armbian forums are the authoritative source, but yes, getting peripherals and kernels to work stable it seems. I am using the odroid HC1 test image that I was sharing and it works fine.