We bumped VirtualBox to the new major series, 5.2.x and starting with this release, we deprecated the xf86-video-virtualbox driver in favour of the much cleaner xf86-video-vboxvideo driver. Since these drivers cannot coexist at the same time, the system update will cause file collisions. However this is really easy to fix, just follow the instructions bellow.
If you use Redcore Linux installed on a virtual machine (Virtualbox) :
sisyphus force-uninstall xf86-video-virtualbox
sisyphus upgrade
If you use Redcore Linux installed on a real machine or on a virtual machine (QEMU, WMware, etc):
sisyphus uninstall virtualbox-guest-additions virtualbox-guest-dkms xf86-video-virtualbox
sisyphus upgrade
If you don't have virtualbox-guest-additions && virtualbox-guest-dkms && xf86-video-virtualbox installed :
sisyphus upgrade
Note : you can check if you have the above packages installed using :
qlist -ICv|grep virtualbox