I installed Solus Budgie in VirtualBox 5.12.2 using the Solus Budgie ISO from the website.
Install and reboot worked fine.
Software updated showed several hundred updates available, I updated, then restarted.
On restart when the GUI login loads the video display is messed up.
The system is not locked up, I can log in actually, but the video display is just all janky.
Some people like myself might be interested in trying Solus in a VM before switching.
VirtualBox is a pretty popular VM tool, it's components are used in other VM implementations.
It might be worth looking to see if a video driver update is breaking Solus in VirtualBox.