Hi @Tonyrambler
Debian Pureblends are Debian OS’s that are “a solution for groups of people with specific needs.” See here for more specifics of what they are. In short, they are “Debian” bundled with free software from the Debian repo and are configured for “specific needs”.
Freedombox is a Debian pureblend; meaning that at it’s core it is Debian. The difference is, it’s pre-bundled and configured with the specific programs that meet with the Freedombox project goals.
On how to install FBX, you can go both ways:
a. if your SBC is listed on the FBX download page, then installation is a one-time smooth process where you download the image, put it on a drive, power up your board and follow the on-screen directives.
b. if your SBC is not listed (or you choose to manually install FBX), then installing Debian first and then FBX on top of that is another way.
In either case, if your SBC can run Debian without any issues, it will run also FBX on top of it.