VirtualBox 6.1 was released on the 11th of December and I totally missed it.
I spotted it this morning, downloaded it and installed in straight away. I had no installation dramas on Windows 10, macoS Catalina and Oracle Linux 7 hosts.
The problem *for me* was the current version of Vagrant (2.2.6) doesn’t support VirtualBox 6.1 yet. I can’t live without Vagrant these days, so I installed VirtualBOx 6.0.14 again and normal life resumed. See Update.
I’m sure there will be a new release of Vagrant soon that supports VirtualBox 6.1, but for now if you use Vagrant, don’t upgrade to VirtualBox 6.1 yet. I’m sure you won’t have to wait long… See Update.
Update 2 : I’ve followed Simon’s post and it worked fine. If you are using Windows 10 as the host and have done a default installation of Vagrant, the files he’s discussing are in these directories.
Update 3 : I updated by work PC also. It required a couple of reboots to get things working. I think it may be something to do with the way we do security here. It’s working fine now.