I've been having difficulty installing Virtualbox 5.2 on Debian Stretch. I've tried the virtualbox repos, I've tried the stretch-backports repos, I have the correct kernel headers, and I have secure boot disabled, and virtualization enabled in BIOS.
When I run virtualbox, I get this
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WARNING: The character device /dev/vboxdrv does not exist.
Please install the virtualbox-dkms package and the appropriate
headers, most likely linux-headers-amd64.
You will not be able to start VMs until this problem is fixed.