After working on this a bit more, this problem is probably caused by Secure Boot being enabled on my dual-boot (w/ windows 10) system.
https://askubuntu.com/questions/760671/could-not-load-vboxdrv-after-upgrade-to-ubuntu-16-04-and-i-want-to-keep-secur
After working on this a bit more, this problem is probably caused by Secure Boot being enabled on my dual-boot (w/ windows 10) system.
https:/ /askubuntu. com/questions/ 760671/ could-not- load-vboxdrv- after-upgrade- to-ubuntu- 16-04-and- i-want- to-keep- secur