For RPI3 based solution, below 3 are easiest way to get it up running in no time
1 Follow the steps in below. This has the image ready to use
2 .Download ubuntu yourself and configure it for astro using the scripts.
3.Same as above 2 but with little extra features and support
For Armbian based on Tinkerboard
I use the below Wifi adapter compared to inbuilt for better coverage.