Hi Steve,
This is my first post here, I recently stared using Armbian, and it is really good. I had the same problem with my new Renegade board, this is the solution:
- Go to https://dl.armbian.com/renegade/archive/
- Get this file: Armbian_5.75_Renegade_Ubuntu_bionic_default_4.4.174_desktop.7z , 174 is the last version that works for Renegade
- Before upgrading, sudo apt-mark hold linux-image-arm64
The version 4.4.180/5.88 has this issue for Renegades, I am investigating.