Use vnc to watch the initial boot sequence for any fpc errors. Conclusion
Which are you deploying on (KVM, ESXi, or a lab environment like EVE-NG/GNS3)? verified download juniper vmxbundle 171r18tgz work
Juniper provides automated orchestration helper scripts written in Python and shell code inside the bundle to manage the lifecycle of the virtual machine instances. Orchestration Execution Use vnc to watch the initial boot sequence