Axios
That is likely because you have not restarted since you installed virtualbox.
I assume you are running the default kernel linux-current
in which case make sure you installed virtualbox-current
not virtualbox
See: https://help.getsol.us/docs/user/software/virtualization/virtualbox
Personally I prefer virt-manager
because in my experience it performs better and doesn't have kernel specific builds, some people find it a bit more clunky to work with but its just different to what they are used to.