Preparation   Supported build environment is Ubuntu Focal 20.04 x64 (minimal iso image).   a guest inside a VirtualBox or other virtualization software, a guest managed by Vagrant . This uses Virtualbox (as above) but does so in an easily repeatable way. Please check the Armbian with Vagrant README for a quick start HOWTO, inside a Docker ,  systemd-nspawn  or other container environments (example), running natively on a dedicated PC or a server (not re