I am not sure if this is the right post but I seem to have the same problem. I am trying to reinstall my Cubietruck 3 with this file : Armbian_21.08.1_Cubietruck_focal_current_5.10.60_xfce_desktop. It boots fine does everything according to the documentation, starts "starting desktop environment" and that was the last I saw. No doubt I am doing something wrong but being a CP/M, DOS, Windows guy I am not familiar with Linux....
Regards Nico
(Netherlands)