@psych, svenyonsonNov 21 11:01:48 dhcp-23-236 installd[881]: ./postflight: /Library/Application Support/VirtualBox/VBoxDrv.kext failed to load - (libkern/kext) system policy prevents loading; check the system/kernel logs for errors or try kextutil(8).
Merging your thread with the prominent thread dealing with the issue. Read it from the beginning...