Wanting to try out MMDVM on the Pi, I came across a distribution called Pi-Star that is excellent and extremely simple to set up. Brilliant work by Andy Taylor, with responsive Facebook support group.
Have used with a Pi2 and Pi3 in combination with DVMega BlueStack connected via USB for about a week now.
This evening I added a Nextion 2.4″ screen that I purchased a while ago but was still sat in its box. Up and running displaying modes and callsigns in less than 30 minutes! Brilliant.