Runcloud installation scripts has dependency of 2 packages which does not comes in by default in some Ubuntu images that Hetzner provides (Eg: Ubuntu-20.04-minimal).
That’s why the installation script will fail and runcloud-agent might not start. To fix the issue you must run the following command and then run the installation script.
sudo apt install gnupg libmagic1 -y
gnupg package is required to import 3rd party repos such as MariaDB where
libmagic1 package is required by