After installing the virtualbox package, you won't be able to run VMs until you:

sudo modprobe vboxdrv --force-vermagic

If you don't do this you'll get an error about needing to run /sbin/vboxconfig as root, but that program doesn't exist. :/

This solution was found here.

You'll also want to install the virtualbox-guest-iso package if you're running windows as a guest.

* pacman commands and their dnf, apt, etc, quivalents. (highly useful!)

Searches the repositories to find which package contains a particular file, use the https://wiki.archlinux.org/index.php/pkgfile:pkgfile command. This command isn't installed by default on Manjaro. It's in the pkgfile package.

To install:

sudo pacman -Sy pkgfile
sudo pkgfile --update #You'll want to run this if its been a while to (re)build indexes

To find which package contains a command:

pkgfile -vb <file>

Command line arguments