Dedoimedo posted VirtualBox & unknown version of X Window system
A quote from the article:
I've smithed a short tutorial explaining how to work around the issue of VirtualBox detecting an unknown version of X Windows system in Linux guest operating systems without having to upgrade the software, by using drivers from newer versions of VirtualBox Guest Additions ISO files, some other tips and tricks, and more. Enjoy.VirtualBox & unknown version of X Window system @ Dedoimedo