VirtualBox 6.1 works no longer on my Ubuntu 20.0.4.1 LTS.
It says:
Kernel driver not installed (rc=-1908)
The VirtualBox Linux kernel driver is either not loaded or not set up correctly. Please reinstall virtualbox-dkms package and load the kernel module by executing
'modprobe vboxdrv'
as root.
I am using the Ubuntu version of VirtualBox. I tried to re-install VirtualBox with the synaptic package manager, but ran into other problems, meaning VB can no longer be installed.
It was working properly until the last kernel update a week ago.