VBox extensions are needed for remote desktop integration and USB passthrough newer than USB 1.1 iirc. Hmm, and maybe 3d acceleration? Not sure exactly, but any

VBox extensions are needed for remote desktop integration and USB passthrough newer than USB 1.1 iirc. Hmm, and maybe 3d acceleration? Not sure exactly, but anyway, iirc: sound, folder sharing, and definitely mouse integration are part of the open source / freely licensed part. I didn't know that KVM was a Linux kernel API actually, seems odd that they're not all using that as that sounds like it should indeed give the best performance and stability! Apparently proxmox does, but not vmware, virtualbox, qemu, or others whose name I might have heard. > I'd expect the main use of a VM to be running random programs that don't work on the native OS At work we use it for security, so things like meetings (video calls) are in a separate VM, so sound is a nice to have there, one could say. Privately, I indeed use it for running software that WINE has trouble with, like games, where sound is also not exactly optional if you want "your base is under attack" alerts. Lastly, I use it for some Windows server software that I fell in love with a decade ago and didn't manage to find a good Linux replacement for: there, indeed, I didn't need sound. > Because it's already there My start menu doesn't have virtualisation software out of the box, and apt install virtualbox is as simple as figuring out what front-end might be able to talk to KVM. Or, for Windows, finding where to get that command-line utility that talks to Hyper-V in the kernel for non-pro Windows versions I agree about the Oracle hostility thing, though