Yesterday I installed Qubes 4.2.2 (R4.2) on my machine. Everything went fine, I could finish the configuration process after the first boot to the installed Qube OS. But after the next reboot I just saw this on my screen:
Would you please provide more information on the hardware specification of your system (e.g. Laptop/Desktop model, Graphic Card, …). And if you did anything custom during installation (e.g. multiple operating systems, custom partitioning, …).
Maybe it’s an issue with nouveau driver for your NVIDIA.
You can try to boot with nomodeset kernel command line option. You can add it in your GRUB like this:
Or you can try to reinstall Qubes OS with kernel-latest, there is a separate GRUB menu option for this in the Qubes OS installer: