I just updated to Sonoma (14.3.1) from Ventura (13.6). I have a very large Ubuntu VM and I held off updating to Sonoma expressly because VirtualBox did not appear to work. I am happy to report that after some effort, I now have my Ubuntu VM running on VB on Sonoma 14.3.1. It took some doing, and much of the above wisdom was useful. Here is in general what I had to do to get over the
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NSFAILURE (0X80004005)
In addition having to allow the security preferences in System Settings and rebooting, I still had issues. What I ended up doing was re-downloading Virtual Box (7.0.14 r161095) and then reinstalling VB directly. Note that I did not uninstall first. I simply had to install, reboot, then my old VB VM worked just fine. (At least so far).
Part of why I updated to Sonoma is because my Mac seems to be getting slower and more fragile WRT how the mouse pointer actually works and it was nearly impossible to use machine at some point. (Could well be one of the other apps I've updated recently which 'broke' MacOS, and one of the ways it shows happens to be in VB). In the end, things seem more stable now and faster. Having said that, I'm not yet strongly using the VM. That will be shortly (Running EDA engineering tools which beat the crap out of the VM).
My computer:
2019 MacBook Pro 16 inch
8 core 2.4Ghz i9
64GB RAM (48GB applied to VM)
Sonoma 14.3.1