OctoPrint setup 20200121.zip (5.8 KB)
The attached file contains a set of directions for installing OctoPrint onto to a full [buster] version of Raspbian, one with all recommended software installed. This process worked on my Pi 4 with 4GB of memory.
Installation seems to work reliably when using a wired high-speed internet connection, but it sometimes stalls out if using WiFi. Your mileage could vary.
Blue Heron Scientific, LLC.