I created a new VM in Virtualbox on my Pop_OS! machine to install Rocky Linux but received the below error when trying to start the virtual machine:             A quick search on the internet took me to the solution in this post. Thanks to Ali Razmdideh for the answer. I’m posting the steps here in case I need to find it again quickly. From terminal: sudo apt update sudo apt install –reinstall linux-headers-$(uname -r) virtualbox-dkms dkms sudo modprobe vboxdrv I did not reboot and managed to start the virtual server.