Hi,
I'm trying to use armbian OS to host hass.io, and have ran into the same problem.
I can't install docker. Tried all suggested here, and then others too. All failing, common error also being 404 (not found).
Armbian config fails at as described, jumping suddenly from 3% to 100% and then back to the install selection window with the selection ticks not marked.
I'm running version 20.05.6 stable