I’ve tried several possible ways to install: gnome-boxes, virtualbox and boot from usb-stick (install on another big usb-stick). All gave me the same error in the generated install-log-output:
2023-02-05 - 23:35:37 [1]: void Calamares::ViewManager::onInstallationFailed(const QString&, const QString&)
ERROR: Installation failed: "Package Manager error"
Didn’t try the cli-install so far , I tried the calamares (online-install-method).