Staging VM boot is broken

On boot Azure serial console shows:
```

You are in emergency mode. After logging in, type "journalctl -xb" to view
system logs, "systemctl reboot" to reboot, "systemctl default" or "exit"
to boot into default mode.

Cannot open access to console, the root account is locked.
See sulogin(8) man page for more details.

Press Enter to continue.
```
it continue to boot if i press enter. We need to investigate reasons.

Start with the staging VM's Azure serial console and collect the output from journalctl -xb to identify why it enters emergency mode. Check the boot path around the locked root account and confirm the VM reaches its default mode without pressing Enter; record the cause and evidence when the issue is resolved.

Written by the indexing model from the issue text.