I'm running VirtualBox (updated) on a Dell workstation, and trying to get a Solus 4.0 VM working. It starts out in a tiny window, as usual, but I cannot toggle it to full-screen with <Home + F>. I'm not jumping to conclusions here, but I suspect it's a Solus issue, because an openSuse Leap VM works just fine on the same host.
When a VirtualBox VM is created, one needs to select "Linux" as the OS and then select the distro. There isn't one for Solus, which I imagine is the root of the problem. VirtualBox doesn't know what drivers to provide. I've tried a couple without success. I've also installed virtualbox-guest-common and virtualbox-guest-current without changing anything. And I've inserted the current VirtualBox guest additions from the host (Solus handles that very well!) without success, either.
Does anyone have a suggestion? BTW, I'm running Solus 4.0 on three machines (NOT VMs) just fine.